Customer Service

I'm so PISSED OFF!! I ordered books from them like a year ago, which was supposed to be 5 books for $1, it turned out to be $14, but it's still a good deal I thought. So I got the books and then few months late I see my account is charged for $45!!! I was furious that they charged for some other books I've never ordered. Apparently I automatically agreed for a requirement to order 4 books or something like I don't even remember. Thank God, that when I did my first purchase with them I did it through PayPal, so I immediately opened the case in PayPal saying that it was unauthorized transaction. So I got my money back. But not almost a year after I receive a letter from a collector that I owe DoubleDay club $180!! And I can't even cancel my membership!! what kind of scam is that? Is there a way to close this scam company? Im willing to sue them as I'm at my boiling point