19-07-2020 1:54 PM
See "What to do about Negative Feedback" on here:
http://sellercentre.ebay.co.uk/private/feedback
If you use eBay's automatic Unpaid Item Assistant the buyer is blocked from leaving f/b as soon as the case is opened.
http://pages.ebay.co.uk/help/sell/unpaid-item-assistant.html