Hi, Ana!
If that was the case, the credit card companies would have cancelled all credit cards of the customers affected and issued new ones.
I have a Mastercard and, a few months ago, I was advised by my bank that the system of a merchant I had dealt with was compromised, so they cancelled my credit card and issued a new one.
I have always ordered from Dave if a game I wanted wasn't available in Canada, so I hope he is able to sort out the problems he is experiencing.
Susan