Messagio

Terms of Service

Version 1.0 · Effective: 15 April 2026 · Last updated: 15 April 2026

These Terms of Service ("Terms") govern your access to and use of the Messagio platform, websites, APIs, integrations and related services (collectively, the "Service") operated by Mariza Katsantoni, sole proprietor, trading as BIGG AI / Messagio ("Messagio", "we", "us" or "our"). By creating an account, accessing or using the Service, you agree to be bound by these Terms. If you do not agree, you must not use the Service.

1. About Us

  • Legal name: Mariza Katsantoni (sole proprietor)
  • Trading as: BIGG AI / Messagio
  • VAT (ΑΦΜ): 076937952
  • Tax office (ΔΟΥ): ΚΕΦΟΔΕ Αθηνών
  • Registered in: Greece, European Union
  • Contact: hello@bigg.gr
  • Website: https://messagio.app

2. Definitions

  • Customer / You: the legal entity or natural person that has created an account or purchased a subscription.
  • End User: a visitor or contact communicating with you through channels connected to the Service (live chat widget, Messenger, Instagram, WhatsApp, Telegram, Viber, Email, etc.).
  • Customer Data: all data submitted to or processed through the Service by you or your End Users.
  • Subscription: a paid or free plan granting access to the Service.
  • DPA: the Data Processing Agreement available at /legal/dpa.html, which forms an integral part of these Terms.

3. Eligibility & Account Registration

You must be at least 18 years old and legally capable of entering into binding contracts. If you use the Service on behalf of an organisation, you represent that you are authorised to bind that organisation.

You must provide accurate, complete and current information during registration, keep it up to date, and safeguard your credentials. You are responsible for all activity under your account. Notify us immediately at hello@bigg.gr of any suspected unauthorised access.

Before you may use the Service you must accept (i) these Terms, (ii) our Privacy Policy, and (iii) our DPA. Your account is not activated until all three are accepted.

4. Subscriptions, Billing & Trials

4.1 Plans and pricing

Pricing is published on the Service and may be updated with notice. Current plans include Free, Starter (€35/month or €350/year), Professional (€99/month or €990/year) and Enterprise (€299/month or €2,990/year), plus optional add-on modules. All prices are exclusive of VAT, which is added where legally required.

4.2 Payment

Paid Subscriptions are processed by our payment provider Stripe. By subscribing you authorise recurring charges to your payment method for each billing cycle until you cancel. You are responsible for keeping payment details up to date.

4.3 Taxes and VAT

We issue invoices compliant with Greek and EU law. For EU business customers, the reverse-charge mechanism may apply where you provide a valid VAT number verified via VIES.

4.4 Free trials

Free trials (where offered) are limited to one per customer, non-transferable, and convert to a paid Subscription at the end of the trial unless cancelled before. We may change or end trials at any time.

4.5 Renewals and cancellations

Subscriptions renew automatically for the same billing cycle. You may cancel at any time from your billing page; cancellation takes effect at the end of the current paid period. Downgrades take effect at the next billing cycle.

4.6 Refunds & EU consumer right of withdrawal

If you are a consumer resident in the EU, you have a 14-day right of withdrawal from purchase (Directive 2011/83/EU). However, by activating and using the Service within that period you expressly consent to immediate performance and acknowledge that you lose the right of withdrawal once the Service has been fully performed. Fees already paid for the period used are non-refundable except where required by law or expressly stated by us.

4.7 Late payment

If a payment fails, we may retry the charge, suspend access, and/or terminate the Subscription after reasonable notice. Statutory interest on late payments may apply.

5. License & Acceptable Use

Subject to these Terms and timely payment of fees, we grant you a limited, non-exclusive, non-transferable, non-sublicensable right to access and use the Service for your internal business purposes.

You must not:

  • Use the Service to send unsolicited commercial messages (spam), phishing, or otherwise unlawful communications;
  • Violate applicable laws including the GDPR, ePrivacy, consumer protection, anti-fraud, sanctions, or export control laws;
  • Transmit malware, viruses, or content that infringes intellectual property, is defamatory, obscene, harassing, or otherwise harmful;
  • Use the Service to deceive End Users into believing an AI is a human agent beyond what is permitted by applicable law (see our AI Disclosure);
  • Attempt to reverse engineer, decompile, or derive source code of the Service, except to the extent expressly permitted by law;
  • Resell, sublicense, white-label, or provide the Service to third parties without our prior written agreement;
  • Interfere with or disrupt the integrity, security, or performance of the Service;
  • Use the Service to collect special categories of personal data (health, biometric, political opinions, etc.) unless you have an appropriate lawful basis and have notified us in writing;
  • Circumvent rate limits, usage quotas, or security features.

We may suspend or terminate accounts that we reasonably believe violate these rules.

6. Third-Party Channels & Integrations

The Service connects to third-party platforms (Meta/Facebook, Instagram, WhatsApp Business, Telegram, Viber, Google / Gmail, Stripe, OpenAI, Anthropic, Magento, etc.). Your use of those platforms is subject to their own terms and policies. We are not responsible for the availability, accuracy, or acts/omissions of third-party platforms, and we may be required to suspend features if a third party changes its terms or APIs.

7. Customer Data & Data Protection

As between you and us, you retain all rights in Customer Data. You grant us a worldwide, royalty-free licence to host, process and transmit Customer Data solely to provide and improve the Service, prevent abuse, ensure security, comply with law, and as otherwise described in our Privacy Policy and DPA.

You represent and warrant that you have all necessary rights, consents and legal bases to provide Customer Data to us and that our processing on your behalf will not violate any law or third-party rights.

Our DPA governs the processing of personal data on your behalf and is incorporated into these Terms by reference. For personal data we process as controller, see our Privacy Policy.

AI features: we do not use Customer Data to train our own or third-party AI models. See our AI Disclosure for details.

8. AI-Generated Content

The Service includes AI features (e.g. Melina AI / Mariza AI). AI output can be inaccurate, incomplete or unsuitable for a given purpose. You are responsible for reviewing AI-generated content before sending it or relying on it. We provide AI features "as-is" and make no warranty that output will be accurate, error-free, or fit for any particular purpose. Compliance with the EU AI Act (Regulation (EU) 2024/1689), including transparency toward End Users that they are interacting with an AI system, is a shared responsibility: we implement the technical transparency controls and you must not disable them.

9. Intellectual Property

The Service, including all software, design, logos, documentation and content (excluding Customer Data), is owned by Mariza Katsantoni or our licensors and is protected by copyright, trademark and other laws. No rights are granted except those expressly set out in these Terms.

If you provide suggestions or feedback, you grant us a perpetual, irrevocable, royalty-free licence to use it without restriction.

10. Service Availability & Support

We strive to keep the Service available 24/7 but do not guarantee uninterrupted availability. Planned maintenance, third-party outages, force majeure, or security incidents may cause downtime. Support is provided via hello@bigg.gr and the in-app support channel during normal Greek business hours.

11. Confidentiality

Each party agrees to protect the other's confidential information with at least reasonable care, to use it only for the purposes of these Terms, and not to disclose it except to personnel or advisors bound by confidentiality obligations, or as required by law.

12. Warranties & Disclaimers

Except as expressly set out in these Terms and to the maximum extent permitted by applicable law, the Service is provided "as is" and "as available". We disclaim all implied warranties, including merchantability, fitness for a particular purpose, non-infringement, accuracy and uninterrupted operation. Statutory warranties that cannot be excluded for consumers remain unaffected.

13. Limitation of Liability

To the maximum extent permitted by law:

  • Neither party is liable for indirect, incidental, special, consequential, exemplary or punitive damages, or for lost profits, revenue, goodwill, or data, even if advised of the possibility.
  • Our total aggregate liability arising out of or relating to the Service in any 12-month period is capped at the amount of fees you actually paid to us during that period, or €100 if no fees were paid.

Nothing in these Terms excludes or limits liability for (a) death or personal injury caused by negligence, (b) fraud or fraudulent misrepresentation, (c) gross negligence or wilful misconduct, or (d) any other liability that cannot be lawfully excluded.

14. Indemnification

You agree to defend, indemnify and hold harmless Mariza Katsantoni and her affiliates, agents and personnel from and against any third-party claims, damages and costs (including reasonable legal fees) arising out of or related to (i) your Customer Data, (ii) your use of the Service in violation of these Terms or law, or (iii) your infringement of third-party rights.

15. Suspension & Termination

You may terminate your Subscription at any time from the billing page. We may suspend or terminate your account immediately if you (i) materially breach these Terms, (ii) fail to pay fees when due, (iii) use the Service unlawfully or in a way that risks harm to us, other customers, End Users, or third parties, or (iv) if required by law or a third-party platform.

Upon termination: (a) your right to use the Service ends; (b) outstanding fees remain due; (c) we will retain Customer Data for the periods set out in our Privacy Policy and DPA (conversation records: 12 months; billing records: 10 years as required by Greek law); (d) you may request export or deletion of your personal data subject to applicable legal retention obligations.

16. Changes to the Service or Terms

We may update the Service and these Terms from time to time. Material changes will be notified by email and/or in-app at least 30 days before taking effect. Continued use after the effective date constitutes acceptance. If you do not accept the changes, you may terminate your Subscription before they take effect and receive a pro-rata refund of pre-paid fees for the unused period.

17. Governing Law & Jurisdiction

These Terms are governed by the laws of Greece, excluding its conflict of laws rules and the UN Convention on Contracts for the International Sale of Goods. The exclusive venue for any dispute is the competent courts of Athens, Greece, without prejudice to mandatory consumer protection rights that allow EU consumers to bring proceedings in their country of residence.

EU consumers may also use the European Commission's Online Dispute Resolution platform: https://ec.europa.eu/consumers/odr.

18. Force Majeure

Neither party is liable for failure or delay caused by events beyond its reasonable control, including acts of God, war, terrorism, strikes, internet or third-party platform outages, government action, epidemics, or natural disasters.

19. Assignment

You may not assign these Terms without our prior written consent. We may assign these Terms in connection with a merger, acquisition, or sale of all or substantially all of our assets, on notice to you.

20. Miscellaneous

These Terms, together with the Privacy Policy and DPA, constitute the entire agreement between you and us regarding the Service and supersede any prior agreements. If any provision is held unenforceable, the remaining provisions continue in full force. Our failure to enforce a right is not a waiver of that right. Notices to us should be sent to hello@bigg.gr. Notices to you may be sent to the email on your account.

21. Contact

Questions about these Terms:
Mariza Katsantoni
Email: hello@bigg.gr
Website: https://messagio.app