I sold a car cover to a buyer in the Netherlands, who on receipt emailed and complained that it had holes in it. I didn't see any holes when it was packed, but have learned from bitter experience that PayPal never back up the seller so told them I didn't know of any damage but they could send it back and I would refund them.
Today I get it back, and it becomes apparent that they've opened the packaging with a knife and slit the cover at the same time, and that's why they want a refund. What do I do next?!