Contact any admin of that server and request the unban. Btw it could be possible that you were just tempbanned. So try to join sometimes and you'll see.
@ xxdeluxe: You even asked this in the Game Banned thread. Please do not make multiple posts concerning the same problem - we see your question as it is and we will answer it when we can.
As I already said, Unreal Software is not affiliated with that server, or any servers for that matter, and thus cannot unban you. You will have to contact the owner or administrator of that server.