Hello luciabarbieri,
Thank you for posting in Microsoft Community.
I appreciate you raising this concern to us and sorry to hear about your negative experience with the Surface support team. As a Microsoft customer support agent, I can assure you that we strive to provide the best possible support to our customers. If you are experiencing issues with your Surface Pro 9 battery, I recommend contacting our support team again and explaining your situation. They may be able to provide you with a solution that does not require you to pay for repairs. Contact Surface Support for Business and Education customers - Surface | Microsoft Learn
Additionally, if you would like to provide feedback on your experience, you can do so through the Microsoft Feedback Hub. Send feedback to Microsoft with the Feedback Hub app - Microsoft Support
Thank you for your continued support of Surface products.
Best wishes,
Rolando S.