It was me who banned you. At the end of a round, I saw, in the chat log, that you tked someone, and seconds later you wrote "I just tked 2 guys for stealing my balista" (or something like that). You admitted the tk(s) and at the start of the next round I see you teamkill on purpose again. Not knowing the rules doesn't justify breaking them (although I doubt you wouldn't know the rules since I believe you are not new in cRPG).
If someone is (unfairly) taking control of the ballista you are already controlling, if I were you, I'd try to reason with him, nudge or kick him away, or just swallow my pride and let him use the ballista, but not teamhit and teamkill him. That's never sensible or convenient for the team.
Unban date: 08.02.2014 17:15:31 (GMT+0).