I was playing the game without addons and I got banned for hacking/cheating.
It can happen, trust me. Someone here on the forums suspected that I had something to do with the DDOS attacks.
Could also just be some game/server/database bug.
Using the ban appeal thread they will only confirm that the account was used for hacking/cheating. Not really investigate in what happened.
So there is no way back in it seems.