Sometimes returns don't show up in Resolution Centre so go to your My eBay > Messages, click on the return message from ebay and then click on the blue "See return details" tab. Near the top right of the next page you should see - "If you no longer want to return this item, you can close this request". You can also do it via Res Centre if it's there.
Only do that after problem has been resolved. You won't be able to open another case on ebay.
