I know this is an older thread, however, you absolutely CAN attempt to cancel a refund. You just need to call Paypal and talk to customer service, Specifically someone in the transactions departement. I had a situtation with a sketchy sale on eBay, and because I have a heart, I decided to issue this person a refund. It turned out being too questionable for my liking, and I did call PayPal to get the refund on my end cancelled. You just need to be persistant and friendly. They will help you.
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