[asavantage]

If it is a credit or debit card you should be able to claim back any payment taken within I think 3 months. Tell your card company that it is fraud and that you have no idea why or what the money was take for - don't explain why or how it came about. It will then be for the company that took the money from you to pursue you, if they think you own it to them.
This is just an amateur suggestion so I have no idea of the potential consequences ...