Who could get a refund when canceling Amazon Prime?
According to the terms and conditions, people that cancel without using any Prime benefits (such as free shipping or Prime Video) could also be automatically eligible for a refund.
However, consistent with DoNotPay, you'll request a partial refund for the remaining time. It seems to be hit or miss on whether or not you will get one, but it's worth contacting Amazon support and asking.
I contacted Amazon's chat support while researching this text and was quickly told that there have been no refunds given, but you'll have better luck than I did, especially if you're fully closing out your account. DoNotPay recommends calling Amazon support or using the Contact Us form rather than chat.