How do I get a refund on a book purchased by mistake

Hello ~ Take a look here by clicking on below…

Request a refund for apps or content that you bought from Apple - Apple Support

You should be able to ask for a refund there. Take care.

~Katana-San~

Here's how to request an app or media refund from Apple (From: Request a refund for apps or content that you bought from Apple - Apple Support - see the article for more detail.)

1. Sign in to https://reportaproblem.apple.com

2. Tap or click "I'd like to," then choose "Request a refund."

3. Choose the reason why you want a refund, then choose Next.

4. Choose the app, subscription, or other item, then choose Submit. If you were charged for a subscription that you no longer want, you can also cancel the subscription using the directions in this article --> If you want to cancel a subscription from Apple - Apple Support

Again, read the link I provided. It says:

Request a refund for apps or content that you bought from Apple

Some purchases from the App Store, iTunes Store, Apple Books, or other Apple

services might be eligible for a refund. You can use any device with a

web browser to request a refund.

I just purchased a book on Apple Books by mistake. I intended to buy the audiobook. How do I exchange or a refund?

Ask for a refund (include your reason). Then buy the wanted item instead.