Contact your credit card company promptly. The company could have set up a monthly payment account against your credit card (similar to some ISP methods). Ask the card company for advice, as stopping these types of 'agreed' payments can have difficulties.
If you say the promotion was through CD Wow, then contact them and anyone else involved in this promotion, and express your alarm and dissatisfaction.
Get all this done, with urgency, before funds are taken from your credit card account and further harm is done.