Wow account merged to battle.net

I played my warlock this afternoon, and after a lunch break, I came back and tried to log in again, then it didn’t work anymore. It is said my wow account has merged to battle.net. I was surprised and then I checked my email box. I received a mail from blizzard entertainment, and to my surprised I became Mr. asdf, what the hell? It is said my account has merged into s***@yahoo.cn. And I have never registered anything at so called battle.net. And never did I merge my account to battle.net. And then I contact blizzard by sending them an email, but there is no reply. I have been playing my account for a long time, and my disappointment to the security of blizzard is bigger than life!
And this is what blizzard say
You need to contact our Game Security Team via the Webform on our Website here:
http://eu.blizzard.com/support/webform.xml?locale=en_GB&selection=WorldOfWarcraft
please chooses the category as Account Security / Compromise / Hacked.
Fill in all the information and send it off to them, they will contact you via email.
Technical Support
Blizzard Entertainment Europe
Blizzard Support FAQ - http://eu.blizzard.com/support/index.xml
Contact Blizzard Support - http://eu.blizzard.com/support/webform.xml

Click here for more solutionshttp://www.wowgold365.co.uk/