fucking jesus...
"Dear Sir, It was an honest mistake. I checked and the difference is $4.63 USD which I will be happy to refund. I've saved every last one of your emails. You've been rude and hostile, and I'm sure the authorities on eBay would be VERY happy to see what you've written to me. If you'd gone to your post office to collect your package, you'd have it by now. Do not communicate with me further. I'll send your four dollars in tonight or tomorrow"