Shorty, which not much talk, chat in game is out of control, no monitor and it is messed up, do something BB.
I'm pretty sure you will just give excuses, but the issue becomes really big, and you need to do something.
I can't give any suggestion, as most suggestions are not welcomed, but you may need to implement a reporting system that does auto-ban, like when player get some X reports in a certain time, the player should be banned automatically, like the system in Rainbow Six.
Report for Spam
Report for Toxic
Report for ToU
Something like that.
The report should be available for G1/G3, help and trade channels.
Otherwise, you need to hire 24/7 MODs like other global games (which I can see it is impossible in your case)