I was facing the same problem too. I got hacked, and there was a Authenticator key i needed to put in. I've emailed blizzard and they removed it for me. It just takes one day, so no worries. Whats worse is that they deleted my characters, and replaced them with lvl one's. Sigh! I've emailed them about the problem, i have yet to receive any mail back. It has been a day.