ive gotten this before, It was actually pretty funny, I logged into the wow forums, and when u get to choose what character to chat under I had 10 lvl 1 characters in IF/Org, names LKDALKj sdfjksj and lkjoij ext... Bassically this happens all the time, 99% of the time its not you, and they know that, u call them, and say hey, i think my account was hacked then used to exploit or w/e they see, yeah u were offline from ur home internet IP number, then someone else logged on or w/e.. they lift the ban, reset back to the hour u last played, u continue on..

This process took 45 min. for me the last time it happened

also next process, scan all ur computer, get the virus that couldve done this