HERBALG.COM Ordered a free trial, I had to pay postage or some sm. cost, so they have my debit card #. I finally figured out how to get a copy of the years spending, HERBAL G.COM have been charging me $79.90 1 to Internet

Starting last January, I filled out on the internet a free trial of HERBALG.COM a diet aid. I have not totally figured out how to keep track of my Walmart debit card online. I always was wondering why my money seemed to be wrong. Living off of Social Security I never would have agreed to buying this product and when they asked if I wanted to buy I said no. I must have had to pay postage, for they have my debit card #'s. So for the past year the company has been charging me $79.90 1-2 times a month, it is now over $900.00. I can not figure out why I was never notified from the co. that I was being charged or how much I had paid. Please is there anything that can be done?