I did last year, Spring I think and called my credit card people. They have a whole "section" devoted to helping you/investigating such charges on your bill. If you can't identify it they'll research it and get proof it's yours or not. Someone got my number online and used it for a dating service :-) Too bad I've been happily married 18 years now. The next month there were more, different charges so the credit card company stopped that card and sent me a new one/number.

I buy mostly online (or local to where I live) and I've had my credit card company for a zillion years and they know me, etc. and my credit score is excellent so we have a good relationship together. I call them if I go out of town to let them know where I'm going and when I'll be back and my husband and I now use different cards so if one gets stolen or compromised we still have the other person's, etc.