You are the seller?
Your customer paid you directly to your merchant credit card account?
You refunded directly from your merchant credit card account?
You still have the item and your customer has his money back?
If this is the case, open a Mutual Cancellation request. The buyer has to agree or ignore it. Let him know that. It closes faster if he agrees. This is a friendly way of ending a transaction.
Both of you can then leave feedback, and you get your selling fees back.
Or did the seller pay through Paypal?
Did you refund from that payment to your PP account?
EBay will have been notified by PP, and you should see your FVF on your monthly statement.
Or did you refund from your merchant credit card account?