Suggestion:
Since you have not exceeded your 1,000 free minutes and haven't made material changes to your assistant, the best next step is to contact Vapi support directly with your call logs and account details. They can investigate your billing issue and clarify why TTS charges started appearing. You can reach support here: [Vapi Support](
https://docs.vapi.ai/support) ([source](
https://docs.vapi.ai/faq)).
Source:
- [Vapi FAQ](
https://docs.vapi.ai/faq)