When I went to SC2 beta and tried to enter my account a small box for authenticator popped up.

I have never registered for this service and nobody has my password AND I don't go to any sketch websites.

What can or should I do? Help plz

Hello Tiki

I will look into this issue for you but I encourage you to try to contact our Billing and Account services team as well as my contacts can take some time to get back to me.

You may also want to check the following thread on compromised accounts in the customer service forums:
http://forums.worldofwarcraft.com/thread.html?topicId=14318909866&sid=1

Billing and account services representatives are on hand to take your call between 8am to 8pm PST, at 1-800-59-BLIZZARD (800-592-5499). Customers in Australia should call 1-800-041-378. Our Billing team will be happy to assist you with any billing related questions. We look forward to helping you get this resolved. You may also contact them via email at Billing@Blizzard.com.