Probably nothing "Permanently," certainly nothing we can do.
An IP Block by the Admin can keep them from using a specific computer to troll, but if you're just hopping from one computer to another in your house, or in a public venue like a computer lab or a library, you can probably stay your execution for awhile.
One thing I would do is set up a waiting period for new profiles. I would at least expect people to be reasonably truthful about their geographic location* as it relates to their whois information, and would check that during the waiting period. If your three RJ profile places say Albuquerque, Toronto, and Paris but the server info suggests your new profile was set up via a server in Islamabad, then I'm heading that off at the pass.
* For fun, do an RJ Profile search by checking out your favorite state/country and look at the number of profiles for the town that alphabetically listed FIRST on the drop-down menu. (For example, "Alabaster, Alabama" which has almost as many profiles as Birmingham). We did that experiment recently over at BGCLive and found there were over 3 times as many profiles created for persons claiming they were from "Abbeville, Alabama" than actual people residing there. An admin could wipe out a ton of fake profiles just by blocking people too lazy to list where they're actually at.