Originally Posted by
Llunai
Your account was, at some point, hacked. This happened to my brother as well when he came back from a 6 month break. It's anybody's guess as to when it actually happened.
It's not uncommon to see the hackers get the password via a keylogger, wait a few months to actually get into the account, use a stolen credit card to reactivate it, change the email address and do a battle.net account merge.
When my brother contacted Blizzard they told him he is SOL because it had been several months since the account was hacked and subsequently banned. He's still trying to appeal that, but it doesn't look good.