Hi there,You can refer to Magento 2 RMA Extention by Landofcoder. I found this extension of theirs quite easy to download and use.Hope it helps you!
Please try the MAGENTO 2 RMA EXTENSION from Landofcoder.
Magento RMA Extension (return merchandise authorization) supports the admin to manage and upgrade the product returning procedure for the Magento store.
The RMA module is perfect if you want to employ a comprehensive method to keep track and manage product returns and exchanges with customers.
Make your RMA system seamless to the shopper, build strong relationships with customers, and win their trust and loyalty.
Try it here!