Need help. Being hunted

[War_Master_Ares]

Recently I was playing in a HC game with my Assassin that is currently at level 24 and doing fine, when I decide to help some people do Act 1. Later whilst I am doing Act 1 with them a Necromancer comes in and make a beeline straight for the stair's to Catacombc Lv3, I get suspicious and follow him down. I see him and he is making a beeline for the stairs at Catacombs Lv4, and at this stage I know he is using MH because he made it perfectly through the Levels first try. I ask him politely to turn it off, and he start's taunting me and asking why he should, I hostiled him, with no intention of PK'ing him, when he say's, "Good luck getting down here.", and practically asked me to PK him, so I made my way down, and since he wasn't there I killed Andy, he then came through his TP and his mages began firing upon me so I quickly ran to him and began using Tiger Strike, he just sat there whilst I did this expecting me to die, and in the end it was his dismise. Shortly after he got his clan and now they want my ear, and are threatening to hack my computer, they have me added' to their friends list, so they can trace my every move, anyone here have any idea's as to how to shake them off?
P.S I have no items to offer them, and they wouldn't accept items anyway :P