due to security reasons, it sounds like you will need special assistance as there are no self-service tools available to the end user. In this case, you will have to make use of the Express Lane customer service feature to request correction of the account in question:
Choose the correct category and issue as prompted by the service above and you will eventually reach a web form to enter the details of your specific situation. If you need a suggestion for which support path to follow, try:
iTunes > iTunes Store > Account Management > Managing or editing an Apple ID > Email
As an alternative, if you do not wish to handle it online, you can try calling this number: 1-***-***-****.