Your are going to have to make a unban appeal & explain what has happened.
You can appeal your ban here - https://cmgstudios.net/forums/index.php?/forum/10-unban-appeal
Huge -1 gang is run by quote possibly the worst person on cmg, always looking for an arguement dont think ive ever witnessed him do RP blacklisted from factions the lot, it would be a mistake for this to happen.