How do I go about getting sellers fees refunded for a cancelled sale?

[catzhave9lives]

Hi, I recently cancelled a sale for an item that had been significantly damaged. Fortunately my buyer was very understanding and I refunded him his money back in its entirety. However, I had already paid my sellers fees and now I am wondering how I go about getting those fees refunded back to me.  I'm also wondering if I can get my paypal fee refunded back as well. Not sure what to do as I've never had this happen before. any information and help on this matter will be greatly appreciated! Thank you