Comdata Card Catastrophe!?

I accidentally signed up my Comdata account, which I received from my work (jack in the box) with the wrong email address. AND to make matters even more confusing, I can't remember or was never given, my pin number for the account! Called work & they said to call customer service on the back of the card. Even when I call in to customer service, I can't give them my four-digit pin number so they haven't been able to help me! =[ I'm new with this stuff and have no idea what to do now! If you have any idea what to do, please help me...