Fit Factory / Credit card scam

I also got a free sample of a diet pill that I paid $5 shipping and handling. I just noticed on my debit card statement that I have been charged for a membership to Fit Factory. I have never heared of this company. I called to complain and I am supposed to be receiving a refund. I have a funny feeling I won't ever recieve it. They cancelled my membership that I did not know I had!! This is a scam, do not order any free samples on line, you never know what you are getting into!!