That's just seller's remorse.
It's obviously up to you, but I'd have strongly considered disputing it with
eBay as a seller refusing to honor the auction results is every bit as
bad (or even worse) than a buyer refusing to honor the auction result.
I agree. Report him.
Basic Ebay auctions are extremely easy to do - any idiot can do it.
He had six days while he could review and make sure everything was OK,
and revise the listing if and error was spotted.
--
Will