American Magazine Service A Scam to end ALL Scams, Internet

When I got the first call from this company I thought it was a bargain. 

Now I feel trapped because I can't cancel the service.  I paid the outstanding balance in September, 2012 and told them, again, to cancel my subscription.  I thought that would be the end of it.  

Today I got a call from a collection agency.  The credit card I used expired the last day of February, 2013.   I told the woman I cancelled my subscription, and she said I see a note in your file, they gave you 14 days to cancel.  I said I told the man I was speaking to that I wanted to cancel it.  Just do it.   

I thought I was done with this company.  Please tell me why this kind of scam is being perpetrated on the unsuspecting conumer.  I thought if I purchased something I had a right to cancel it.  I think it is time to close this company and its' unethical practices down.