I paid for S&H on my credit card for a bottle of vitamins online, it was a free trial. As long as I cancelled within a certain amount of time, i wouldn't get charged. I did that. Then a couple days later I saw this mysterious charge of $69.90 on my checking account. I called the company back, they said that they didn't charge me, and that it was a different vendor or something like that.
and it says on their website to not call your bank, but you SHOULD, they will usually dispute it and you will get your money back.