Freedom is right, notify the police. Although it was tough getting them to do so, the police (at least in my county) now take credit card theft very seriously. It does require a fair amount of time on their part and can lead to a lot of dead ends, but they are now really pursueing these crimes. And if/when you report this to the police they may find that other people who shop there have also had their credit cards compromised. They may be able to find out who is using the cards by finding out what was purchased. Like I said it is going to take time, but report it.