I think it depends on the conditions. If you are the seller of something and the buyer doesn't think he got a square deal, just tell the person to return the item and you will refund the money, including the return postage. That should get him off your back.
You might want to talk to ebay, not just to 'report' the person but to ask if the transaction was covered under any of their various insurance policies. I mean, I don't know what you sold him; if it was a 40,000-dollar Mercedes, coming up with a refund might be a bit tougher than if you sold him a Lionel train set for 30 bucks.
Presumably, as you have made some kind of transaction you both have each other's physical address. If you live at opposite sides of the continent distance might make you safe; if you live two towns apart, it could be a scarier story.
If this person for any reason has threatened physical harm, you have every right to contact the police in his town and tell them that you have been threatened. Threatening words are as much a case for assault as hitting you with a brick. You have the right to ask them to go talk to this person, but of course this might just up the antagonism. I'm hoping refunding his money will do the job, because this is not a good situation.
Buying online is always risky. Therefore, buying from eBay is not without risk. However, eBay does offer Buyer Protection, which makes buying on eBay less risky, than some other websites. eBay Buyer Protection covers items purchased on eBay with eligible payment methods that are not received or not as described in the listing. Always make sure you pay through Paypal to assure you will be covered under eBay's Buyer Protection policy.
If the buyer pays with PayPal the seller should always send the item to the address that PayPal supply. If the buyer wants their purchase sent to an address other than the one that they have registered with PayPal they should add that alternative address in their PayPal account as a "guest" address. If the buyer is paying by means other than PayPal the seller should send to the address supplied by eBay. Whichever address the seller ships to, they should always strongly consider using an online trackable service to best protect themself against an "item not received" claim.
It is unlikely that your computer will pick up a virus by you using eBay but when online you should always be very careful what you click, whatever the site. No eBay would not stay in business very long if that were happening. It is possible that a seller or may be even a buyer on eBay to present you with a link that is a virus, eather through eBay messages or your personal eMail.
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