North American Direct Services Magazine sale, $500 gift card ripoff Reno Nevada

 I was contacted by a company offering me a $500 gift card if I ordered magazines for $39.99. I was told I could cancel at any time. I gave them my credit card number. I never received the gift card and my credit card has been billed $39.99 a month. It is listed as Publishers Magazine 8002470036KS. I tried to cancel, but they still send magazines that I receive renewal notices on. When I don't renew with the magazine they finally stop sending them. but I was still having $39.99 charged to my credit card. I had to get a new credit card so the card they were billing declined there charge. North American Direct Services sent me an invoice stating the decline and show a balance of $518.70. In total they have charged me over that amount already.