Shopper Advantage Taking my money after I canceled Norwalk, Connecticut

I can't remember exactly how I got scammed into this but I remembered contacting Shopper Advantage to canceled my membership since I did not received a gift card and coupons that was promised to me. The representative that took my call was nice and promised that nothing will be charged to my credit card since I canceled prior to the end of my trial date. However, Shopper Advantage been taking $8 each month for the last 4 month from my credit card. I guess the only way to stop this is to cancel my credit card. Lesson learned.