Bankonit had to issue 6 bans today for 2 known hackers but those bans won't stop them from rejoining under a different name. I guess they simply gave up, but you can bet they're gonna rejoin at some point because a ban from within the game doesn't mean much. All they need to do is create a new account.
Your server is one of the last refuges for these idiots and streaming to PBBans will stop them from joining. It's not perfect, but it's a good start.
Please help us to keep the vermin out and start streaming to PBBans!
Dr. Funkenstein