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Not all auctions go smoothly. Maybe the item arrived damaged. Maybe it didn't arrive at all. Maybe it wasn't exactly what the buyer thought he was getting. Maybe the buyer is a loud, complaining, major-league son of a rutabaga.
In any case, if you have a complaining customer, you need to do something about it. Unfortunately, there are really no hard and fast rules for handling post-auction problems. You have to play it by ear and resolve each complaint to the best of your ability.