I have been trying to change my e-mail address, but when it ask for secret answer. I have no idea what it could be. I don't think I ever used one. I do need to change it because centurylink is going to close down qwest e-mail service.
Go ahead and make a ticket at http://us.battle.net/support/ we will get you taken care of. I would recommend a live webchat or a callback request as we will likely need some information that we cannot get over a ticket.