25,000 sweepstakes to be held dec.31 2008 / get 8 magizines only pay for 1 @ 39.00 month

I had a call from united readers service inc. they had a new recruit calling and said her supervisor would call right back to verify if she did everything right. I received the call a few minutes later verifying that I only had to pay for 1 magizine @$39.00 a month. confermation #3335081. They charged my credit card; but when I went to cancel the phone# just kept beeping and the website doesen't give any information either.