Your description of the problem indicates your account has been hacked.
I wish I had better news for you, this forum is just a user to user forum, to protect users, no-one here has any account access, when a Microsoft account is hacked, if the hackers change the associated data like the Email, then that account is usually no longer recoverable, try using the process they provide on this link to recover a hacked account, if this process is not successful, sadly, that account cannot be recovered.