On the off chance that the OP really did not understand the issue -
When Blizzard originally designed WoW, they designed it for two types of people. Those who like playing videogames with other people in a cooperative manner against computer-generated opposition, and those who like playing videogames with other people in a competitive manner against live opponents. They separated these groups of people, giving each their own servers and wrote the rules to encourage these types of play - on PvE servers, almost all actions against players of the opposite factions are against the rules except in designated areas, while on PvP servers almost all actions against players of the opposite faction are encouraged. They very clearly wrote down the guidelines and rules for playing in each type of realm, and allowed the players to choose what their preferred playstyle would be. To avoid the issue of people getting gear in a non-competitive environment to use in a competitive one, they banned all transfers of characters between the two.
You're playing on a server in which, outside of battlegrounds and arenas, factions are not required to interact. Insisting on interacting with people of the opposite faction, even if you're perfectly happy with a PvP response, is simply against the rules. You got caught breaking the rules in both letter and spirit, you got warned, and you're upset because you're playing the wrong version of the game and don't like those rules. Boo hoo. Cowboy up, go roll on a PvP server, or if you don't want to waste all that time and energy leveling another character, put yours up for trade, buy a new one on ebay, or hire a power-leveling service. Oh, those are against the rules too? Doesn't seem like the rules mean so much to you anyway.
If you want so badly to play in a PvP environment, start over on a PvP server. Get up to level 70 with your gear in a place where it takes twice as long to accomplish anything because of the other faction. Earn your new 70. Then grief as much as you like, and see how long it lasts. If your poor level 70 warlock means so much to you, reread the rulebook and play the game by the rules.