I do have the transactions printed and will bring them with me. And yes, I do remember who he was. I'm not sure if he is the owner but I also shopped at that store the month before (but paid with cash) and he was the same person working then.
If he is the owner, and doesn't reciprocate well, the next step would be a police report. I know you're taking care of the situation in the states with your bank already, but I'd hate to think that a store could get away with something like this. Besides, it would be good to have the local authorities knowledgeable about the crime.