Why not have a level requirement to access main chat? Have a help tab that guardians can monitor for noobs that actually need the help, and for them to socialize. That would help get rid of the trolls the create characters that they know are only going to get jailed, just so they can be a nuisance in chat.

If they have to actually develop that character to level 10 or what ever the criteria is, that would deter them from doing it over and over again.