[HELP] My account has been stolen

I haven't played for a couple months, however, my account remained there just in case i wanted to come back. Today, like half an hour ago, i received this email

http://imgur.com/a/OPUgD
http://imgur.com/a/OPUgD

I did as the e-mail says, but i still have no answer from Warmane, the thief has plenty of time to harm my account and the characters i have in there.

Edit: I'm using my best friend's account to post this.