$39.95 UNAUTHORIZED charge on my bank account

I ordered a FREE sample of your product, just pay shipping&handeling. I was then sent another bottle, without me ordering it. I proptly returned it, without opening it. When I received my bank statement, there was a charge of $39.95, which I DID NOT AUTHORIZE!!! I live on a fixed income and CAN NOT AFFORD this added expense!! You need to refund this amount IMMEDIATELY!! If you do not I will be forced to turn this matter over to the legal/fraud department with my bank!!! I suggest you make this right before I take this matter further!! I will allow you 10 days before legal action is taken.