The only way I can think of getting a account banned without being able to get in game is to call blizzard and do a recall. Except give them a different last name. When they say it isnt correct tell them thats what the guy that sold it to you told you it was. Do this a few times to be sure. Only thing is it wont technically be banned but locked. So only way it would be playable again is if the person with the name on the account submitted his id and the proper paper work faxed.