If all else fails contact evony. Have a list of all the alts and have significant proof. You will probably just get an automated message back saying some crap about how they will do their best. Well needless to say the old saying "expect more out of yourself and less out of others" applies to evony as well. If its bothering you and the server that bad then you can ban together to find these cheaters. I'm sure there are alot more that do it and it will be no easy feat, but with the right coordination and the right leadership you can take care of a cheater the way it needs to be done.

Good luck.