There should be a phone number on your statement for the charge. If not, call your credit card company's customer service and ask them who these charges are coming from.

Sounds to me like they sold you one of those try free offers. "Try this offer free for 30 days, if you don't cancel we will charge the membership fee to your card."

If it is, you should be able to cancel and prevent any future fees from showing up (or if yearly fee, get a refund).

If it is fraud, credit card company can remove charge for you