Nostalrius Begins - Quality wow vanilla realm (1.12)

hey, my account got banned just like that ? when i was questing in stv , my char name is orcstar, pvp realm, i don't understand anything , why am i banned ? and yes i did check on the homepage it says i', perm banned ? i have read the rules, the only thing i might have done that is against is that i went with my friend wich is lower level then me, then he tagged some mobs and i just killed em, we did it for like 5-10min max, then we stopped. Please can i get some explanasion here ?