Hey... that is called fraud...
No. That is most definitely not fraud.
Getting ur user's account stolen due to some hack and then ban that user even after he recovers the account you gotta be kidding me.
So what prevents someone from doing something bad, making up a story about them getting hacked and asking for a unban? Pretty much nothing (IP logs are inconclusive proof). I have no idea how you expect anyone to help you, when we don't even know what account you're talking about. One more time:
How about posting the link to the account so that we can see what actually happened here?