That's a yikes. Since that means Fervid is there to stay. Even if bungie didn't implement the change to remove it would need access to the account. I'm also pretty certain when this happens it's normally a case of a hacker hijacking an account then selling it. Then it becomes a tug of war till the owner abandons the account I'm afraid. Honestly might sound a bit strange but trying to get the account banned might be the best course. If you can't get rid of the person. Might as well not let them keep it. Edit: Though first talk to microsoft. See if they can ban the account.