Moderation Tools!
I can't be polite about this since it's been lacking since ...ever!
I'm going straight to the point. We need:
-Ban user by Account and/or IP
-Blacklist in our bracket to prevent the same user joining if he gets banned/kicked
-Report the user account for abuse - HE is abusing YOUR site after all to cause chaos for everyone and we can't do anything to prevent/stop or punish the guy?
Even ONE of this will be a step forward for combating the problem that has been present apparently long before it hit me and our team.
I hope the Challonge team had a good rest .... now get to it.
I know I have been rude and/or vocal etc. but you kinda deserve it at this point.
Best wishes!