Deleting character sound like a terrible idea. Definitely report them and report them again.

Having said all that, can you teleport? If you teleport and they are not your friends list and you did not join their friends list, how can they find you? It like the millenium falcon, you jump into hyperspace and the empire loses Han Solo. Do a double teleport and I'm sure they won't be able to track you anymore. /follow doesn't work when you cross over zones.