You cant un-Banned a Permanent Banned account Time to do what most people do and make a new account and don't do what you did to get banned in the first place. and if you're not permanent banned just wait.
Like the other guys just said, once a account is banned, its banned for good! there is no going back. So just make a new account! and try to be more careful this time .. and make sure you do not mod your profile!
Sounds fishy, even if someone got on your account its your fault. Your account SHOULD have a GOOD password, and you should ofcourse have Microsofts 2 stage verification for added security. You obviously didnt have that since they would need access to you. You can blame anyone but yourself unfortunately. All you can do is, like all the above, create a new account and leave the banned one behind you. :/