I am trying to find out the identity of the person who made the fraudulent charges--that's why I contacted Tagged. Tagged should be able to quickly identify which user used my card information to purchase goods from their website. I sent them three separate requests as a follow-up of the three separate transactions made through Google Wallet, but did not receive a response for any of them.

Yes, I do have the 2-factor authentication and yes, I change my password quite frequently (and changed my passwords for all my accounts on various sites as soon as I found out about this).