Well since its EU and you dont have the new site system, you need to call Blizzard Account Billing, and if you have E-mail, SQ and SA, CD key, BC Key, Account Name, First Name and Last name, you will be able to recall it and change the info. Check one of those recalling guides by using the search function, they help a lot. And you said you have SA, why do you say you cant find it?