i have reason believe it's been hacked and stolen because when i got onto the 'forgot password' page. it has a "back up" email address ive never seen.

no matter how many time i tried with the account retrieve form, it always give me the automatic reply email within 10sec saying no enough information provided.

I really feel helpless here and there are some important emails that i really need to get into in that email account.. 

Is there anyway i can get my account back. I think when i do the security check, i did link my mobile number to the account and i have been receiving message from Microsoft on my phone. 

HELP!!!!