Apperently banned for sh*t-talking to a GM

Was running Gnomeregan with some random doods when i recieved a message from some guy "appearing" to be a Gamemaster ... Untill the fella disconnected and banned me ... i really thought he was no Gamemaster ... the last thing i said to him was "server has a good anticheat , if i WERE hacking i would have been permabanned , its against the rules impersonating a GM, ty" DC, ban .... really .... We wiped ... i entered the instance . and your staff member wrote to me ... thats all ?! i really have no idea what he's taking about 
