#5 - Jan. 24, 2012, 6:40 p.m.
What we can do depends in large part to how long ago this happened, and exactly what happened.
We'll certainly look into this once you report it and do what we can.
What's vital, however, is you find the source of this. It's vital that you make certain of the security of your system and your email account.
These articles may prove helpful.
Security Checklist
http://us.battle.net/en/security/checklistTypes of Account Thefts
http://us.battle.net/en/security/theftYou may also want to look into getting an authenticator for your account. It's no substitute for good security habits, but it will help keep them out of your WoW account.
Blizzard Store
http://us.blizzard.com/store/browse.xml?f=c:6Mobile Authenticator
http://us.blizzard.com/support/article.xml?locale=en_US&articleId=26109