Hi
I completely understand how outrageous this situation is. I recently went through something similar.
I recommend that you try to recover your account immediately through the link: https://account.live.com/acsr. Fill out as much information as you can and use an alternate email for contact.
If recovery fails, please contact Microsoft support: https://support.microsoft.com/contactus, and choose the option “Account Hacked.”.
After recovering your account, I recommend you follow these steps to protect it from hackers: Hackers attempted to steal my Microsoft account
I hope everything goes well, and if there's anything else I can help with, please let me know!
Best regards