Asking for more money?

I purchase a rotating hair instyler November of last year. I admit I miss understood the price that they put to their website. I thought it was only 14.99 buy one take one for free. After I purchase the product I find out that the amount of 14.99 dollar is only for 30 days trial payment and after the 30 day if you decide to keep the item they automatically charge you on your credit card for the whole amount. Since I love what the instyler did to my hair every time I use it I decide to keep it though I made sure that that I also paid the full amount which cost me more than 80 bucks. I didn't mind the cost. What makes me mad is that I received a letter from them yesterday stating that I did not paid them. So they are asking me for another payment and the amount is doubled. OMG are they crazy? And how come they just sent me this letter after FOUR months? I'm planning to call them soon after I finish what I do best...being lazy! Though I hope I still keep the records that stated I already paid them long time ago.

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