Amazon Prime — monthly charge

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I'm getting this monthly charge from amazon prime amzn.com/bill wa. How do i stop this charge on my credit card? I don't remember ordering anything with a monthly charge. I need this matter to get taken care of in a timely manner. I'd appreciate an refund for april, may and june of this year. Each month was a charge of $14.03. I never received anything in the mail stating that there would be a monthly charge for me making an order on amazon.