#16 - July 17, 2010, 2:39 p.m.
I'm terribly sorry to hear that your account has been compromised, Quickwind, but this is not a "realm" issue, but rather an issue of account security as Hathios has mentioned. Somehow, a malicious party was able to glean your account information; more often than not, this occurs when a players falls victim to a keylogger (or other malicious software), a phishing scam, or participates in account sharing with someone whose security is not up to snuff.
I strongly encourage you to pay careful attention to the following threads for more information on how to secure your computer (and any computer used to log into the game, forums, or account management page) and report it as compromised:
What to do if Your Account Has Been Compromised:
http://us.blizzard.com/support/article/30796 Account and Computer Security:
http://us.blizzard.com/support/article/30794 We'll do our best to assist you every step of the way, so please let us know if you have any questions.