Account Hacked - Cd key stolen?

Hi,

I was on my account earlier, and then when I tried to log in a couple hours ago I got an error msg telling me there is no wow account tied to my battle net account.
When I went to log in to battle net my anti virus told me it was a phishing scam, so I eventually logged in to bnet by linking through worldofwarcraft.com account page, and when I checked my account there are no wow games tied to the account any more.

My girlfriend has an account linked with mine that I am also paying for on the same credit card, and her account is now linked with a different account! (The account im posting from now is hers).

Please lock the account so they cant delete all my stuff if they havnt already, ill be calling in tommorow.

Thanks.

oh and for reference , some characters from the account are Poyzun Azeaze Tsquare Hermis ,all on Cho'gall server horde side.