Hello. My name is Michael. I can help you with your question.
The best thing to do, if you don't recognize the charge, is to call the phone number on the back of that credit card and tell them exactly that. They will remove the charge from your card and then investigate it. They will assume you didn't make the charge unless the merchant proves their case, and that it was you who didi it. If you see more than one of these strange charges show up, it would be a good idea to just order a replacement card with a new number on it.