See: https://learn.microsoft.com/en-us/legal/cognitive-services/openai/code-of-conduct
Your account was closed as it most likely didnt follow one of the code of conduct requiremments.
I would recommend you create a support request here:
https://azure.microsoft.com/en-us/support/create-ticket
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola