As much as I agree that it'll be very much better if your friend himself being the one who raise this thread so we can get a first-hand understanding and narrative rather than playing pass-the-note, I think we're beyond moot on that matter. As such, I prefer to try to get this done.

I can't promise you much, as I rarely in touch with duelbit's representative, but let me try to get their attention by as much means of communication as I can or necessary. Just to be sure, your friend's account username is... "username"? I am not sure if this is a correct info and how feasible it is for someone to acquire that username, not to mention what a waste to attain such unique UID and it by got banned on day 1. In case it's an incorrect info you got from your friend, can you perhaps PM me his email address so I can submit both info to duelbit's representative?