Complaint Review: NSS Rewards Cont Serv

I ordered some trial issues of 3 magazines through NSS Magazines. I was informed that I would not have to actually subscribe unless I was satsfied by the magazines I had received during this trial period. However, I got my credit card bill and found out that I had been charged for subscriptions to all 3 magazines at a cost of $80. I never had the chance to cancel these magazines or to avoid the charge to my credit card. I object to this and want a refund.