I've had an issue before where I was charged a fee for a service that I never ordered. It took some persistance with pushing my bank and the bank pushing the merchant. I told my bank, in writing, that I did not order this service. After several attempts on my banks part, my bank told this merchant, out of Australia, that they were rejecting their charge and they would not be getting any money. The merchant finally left me and my bank account alone.
Can you sue them? No. But you can fight the charge and put in a dispute with your credit card issuer. Your card issuer should follow up with a dispute that you file. If that doesn't work I would ask for a manager or someone higher up. If they refuse you can turn them into the Better Business Bureau.
If you have something showing bad on your credit history send them a letter explaining what happened and documented facts. They will review it.
Stormie823
VirtualTrak Technologies