Unauthorized Gemini API charges on a single day (~TRY 2,042) — billing account closed, cannot reach billing support

Gemini API
1

Hello,

I’m asking for help with a billing adjustment for Gemini API usage that I did not make, and for a way to reach Cloud Billing support, because every channel I tried is closed to me.

What happened

  • All usage on the project happened on a single day, 21 February 2026. There was no usage before or after that date.
  • Every charge is Gemini API Generate_content, almost entirely text input tokens and cached input tokens. The total is TRY 1,702.11 plus VAT = TRY 2,042.53 (about USD 50).
  • The project was auto-created by AI Studio (gen-lang-client-…). I did not make these requests. I believe the API key was compromised and misused.
  • The same day, both threshold charges were declined by my bank. The billing account was closed and has had an outstanding balance ever since.

What I have done

  • Removed all API keys in the affected project and in all of my other projects.
  • All of my billing accounts are closed, and no further usage has accrued.

What I tried to reach support

  • Billing Assistant (AI): It confirmed the charges and quoted the policy that requests made with valid credentials are billable even if the key was compromised.
  • Asking the assistant for a human agent: “Live billing chat and email support is not available to closed accounts.”
  • Creating a support case: “You do not have permission to create support cases” (no paid support plan).
  • Collections emails: They come from a no-reply address, so I cannot reply to them.
  • The “Unknown GCP Charge Inquiry” form: It does not apply, because I own the billing account.

Google’s own documentation (Resolve Cloud Billing issues → compromised credentials) says to “contact Cloud Billing Customer Care to report the compromise and discuss potential billing adjustments”, but a closed account has no path to do that.

My request

  1. Could a Google team member route this case to Cloud Billing for a one-time review of the unauthorized usage? I can share the billing account and project IDs privately.
  2. If that’s not possible here, what is the correct channel for a customer whose billing account is closed?

Thank you.