Amazon Prime membership can be manually canceled by Prime users. Prime membership is paid for all users. It comes with a one-time annual membership. Users will cancel and quit Amazon Prime at any point they feel. In some cases, users are eligible for a refund. while signing up for Prime, Amazon asks the users to link their debit or Mastercard that is further verified. this is done for the charges for Prime subscriptions and other payments to Amazon.

Refund Amazon Prime membership
In case you have used some of the Prime services in your paid subscription period, you are still eligible for a partial refund. to know more about this case, check the FAQ section of the web site and the Refunds and Payments sections of the Amazon Prime helpdesk.

Once the refund is approved and initiated by Amazon, it reflects in the user’s account within 3 to four working days. Deductions are not made while initiating the refund. Amazon follows its strict policies for payments and refunds and all these are in favor and goodwill of their valued customers.
https://amazonprimerefundinfo.com/refund-amazon-prime-membership/