Possible Identity Theft Issue

Sounds like someone found out your password on the game and then looked on the website at your information? I don't know for sure though but the only reason I would be concerned with identity theft is if the person also had your full credit card number, social, drivers license number, or bank account information. It doesn't seem like they could do a whole lot in the game and I think that a prepaid card means that they did not use a credit card to purchase it but rather bought it at the store. But I haven't played that game before. Anyways, best of luck to you and let us know how it turns out and I hope none of this came off as rude.