Hey there! Nice to meet you!
I'm sorry you are experiencing this, and that is a possibility.
If you no longer have access to the verification methods linked to your account (and if it is already removed by the hacker) The only way to recover/unblock a hacked account is through the official Microsoft troubleshooter guide:
If the account recovery web form doesn't work, and if the security info has been replaced by the hacker, I'm afraid there is no other working method to recover the Microsoft account, and Microsoft Support cannot help either.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