Cooking Pleasures Deluxe Forged Cutlery Instead of one free knife, somehow company began billing my credit card for more knives Hopkins, Minnesota

In surfing the internet, I came across a page where you could answer survey questions and receive a free knife.  I answered the questions and received me free knife and was well pleased with it.  Several weeks later I received another knife and a wooden knife holder.  I marked on the outside of the box "Return to Sender, Cancel my Subscription."  I did this because the packing slip said the knife and holder were a little over $80 and I cannot afford such things.  Never did I realize that the company had somehow obtained my debit card number and the money had already been taken out of my account.  Earlier this week I discovered that the company had already drafted $68.94 out of my bank account for another knife which arrived yesterday.  I do not know where or how the company obtained my banking information.  I live on a fixed retirement budget and cannot afford expensive knives like these.  I will contact the company another time and attempt to get them to cease and desist, but don't know how successful I will be.