Hi Baseballgirl21
welcome to the Apple Community.
If the membership / subscription was from Apple:
How to: Check the status of a refund for apps or content that you've bought from Apple – Apple Support
or
How to: Request a refund for apps or content that you bought from Apple – Apple Support
or
You might want to reach out to the Billing Support Team:
There is a “Get Support” Link (or an App) at the bottom of their webpage.
Subscriptions and Billing - Official Apple Support
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Else:
If you signed up for membership with audible online, you may need to check with them directly about any refund.
https://www.audible.com
All the best :-)