I'm sorry to hear about this. After doing some research, I've found the following potential solutions to your problem:
1. Keep providing information to confirm your identity - this works for some users.
2. Contact the Microsoft Office support.
3. If they aren't helpful, I'd recommend you to write on their forum in order to have their attention and explain that the support system doesn't work for you - in some cases, the forum moderators reply and offer more help.