Hacked!!!!!

Mokaz covered pretty much everything I would have advised, Dramen.

You will, first and foremost, want to find the source of your compromise before regaining access to your account. This will be the best way to limit the possibility of a second compromise. I've provided the below links for your review that include tips and even a checklist on how to best ensure your computer and account are as secure as possible. >^.^<

Battle.net Account Recovery Form
https://us.battle.net/account/support/account-recovery.html

Account Hacked? Security Issue? Look Here!
http://forums.worldofwarcraft.com/thread.html?topicId=24702231244&sid=1

Battle.net Account Security Awareness
http://us.battle.net/security/

Account and Computer Security
http://us.blizzard.com/support/article/30794

Battle.net Authenticator
http://us.blizzard.com/support/article/24986