How to Cancel Amazon Prime Membership
Amazon Offers their new Prime users one month of free Prime membership and charges a certain amount post that for the annual Prime membership. If you want to discontinue the service, you can cancel your Prime membership and find a refund of that amount by Amazon.

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Cancel Amazon Prime Membership
You can cancel your Amazon Prime membership at any time you want. There are no terms and conditions on that. The users can also get a complete refund of their membership if they meet certain conditions.

If the users cancel the Prime membership during the thirty days of free trial, then they are not charged any money. every user gets the 30-day free trial only one time. therefore after availing the free trial once, if the user tries to log in to Amazon Prime post that, their credit card will be immediately charged and the price for the membership would be deducted. There are two ways} by which you can cancel and end your Amazon Prime subscription.
https://amazonprimerefundinfo.com/how-to-cancel-amazon-prime-membership/