Kross, Lieberman & Stone, Inc gamepal inc commited fraud wont try to fix issue Raleigh, North Carolina

hi am am going to tell you what happened .please forgive my spelling.in 2008 i used to play the game world of warcraft .in the begiening of 2008 i quit playiing.about 6 months later i decided to play agien.when i logged on to sescribe i realized my account was stolen .i called blizzard and reported it stolen.i got my account back .6 months after that i get emails from gamepay saying i have taken back a account that i sold them .i didnt sell them my account .the ip address used wasnt evan in my zipcode .the paypal account they sent the money too wasnt my account .i told them this and nuthing happened .then i get phone calles and letters from Kross, Lieberman & Stone, Inc.saying that i owe 3000 dollars for a account that the i didnt evan sell them that they only paid 150 dollers for .please help i dont know what to do .blizzard cant help gampal wont answer .and Kross, Lieberman & Stone, Inc just says im lying ..idk what to do how do i get this off my credit report