Banned forever.

[Agorith]

IF you request to be banned then you will be banned.
Multiple people have done it before.

So if he gets banned because he requested it, how does he get unbanned now?

Perhaps you could read all the replies, including those of mine, so you're informed we no longer ban on request.
But for the sake of answering your question and sticking to the past, the way people could've gotten them unbanned after having requested a ban, is a simple request trough forum PM.