Hey there! Nice to meet you!
I'm sorry you are experiencing this.
The only way to recover a hacked account is through the official Microsoft troubleshooter guide:
But since the security info has been changed and the 2FA feature has been enabled by the hacker, I'm afraid there is no other working method to recover the Microsoft account, and Microsoft Support cannot help either.
Thank you for your understanding.
Best regards,
Darhyl