Bad shopping experience about this company!

Hey guys, let me tell you about this company.  I had such a bad shopping experience with them.  The name is called Proactiv.  I once went to a mall and saw their products.  They are basically cleanser and treatments.  I was pretty interested and a bought a package.  They asked me to sign a sort of form.  I didn't have any idea what it was about, but the sales rep told me that it was just a confirmation thingy.  So I signed it, and the nightmare began!  Every month ever since I purchased that package in the mall, they sent me another package, and charge me $50 dollars on my card!  I called their office and told them to stop the shipment and credit my money back.  They said that I signed that form!  I told them to ignore that form and just stop sending me the thingy and get my money back!  They said no problem but I still haven't gotten my money back until now!  I am thinking about bringing this to a legal step.  Any suggestion guys?

You've probably seen this before somewhere in the mall:


Try to read carefully the term and condition when you buy them, learn from my lesson!