WHITENINGNOW: Free trial teeth whitening scam!! What can I do to get my money back?

Whitening-now.com lures me with Kathyteeth.com, successful teeth whitening story using only free trail product. So I order a free trial with $6 shipping fee. 15 days later I was charged $ 82 and $ 2.50 international transaction fees with no product received. I was shock!! and immediately called to cancel. They refused to refund my money anyway!! because I didn't call to cancel the free trial within 14 days, he said, I have to pay $ 82 for the trial kit. What a JOKE!!! After an hour of rough conversation, I manage to get the cancellation no. Then I check with my bank and realize that the company charge me another $82 just right when i call to cancel my product. This whitheningnow is a total scam!! please be careful!! The product itself is ineffective. They also use more than 10 different names for the same product and tons of ad webs and blogs to lure you.. I am so mad with this dishonest practice. I realize that many people out there are going through the same awful experience. Please work together to stop this evil business. Thank you