Exactly the same issue on my server with three players with a crazy amount of alts. They seem to enjoy sinking certain players over and over again. They have been reported numerous times to no avail.
One of them even commented in world chat that nothing will happen to them while they are paying customers.
People post in threads openly about having alts and so many others have said they have reported this behaviour and nothing has happened so I guess he is right, nothing will ever be done while money is trickling in.
Sorry I have no suggestion for you, I will follow this thread with interest in the hope a proper answer, hopefully via the devs.
