Refund from Apple on audiobook?

You can use the https://reportaproblem.apple.com/ site to request a refund for an unwanted, unsatisfactory, or undelivered purchase. In principle all sales are considered final, and Apple are not running a try before you buy service, but reasonable requests are entertained. Those who make too many refund requests may find that they are explicitly told that in future refunds won't be offered and cannot make new purchases unless they confirm acceptance of Apple's terms of sale.

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I am not aware of any such three--day policy. But if you have a legitimate complaint, you can always give it a shot with this procedure: Request a refund for apps or content that you bought from Apple - Apple Support

See the articles https://support.apple.com/en-us/HT204084

https://support.apple.com/en-us/HT210904