I take it from the above you are the seller?
Simple Delivery is now mandatory for Private sellers, so if your buyers do not receive their item, they open a case for item not received, and eBay take over, they refund the buyer, and you get to keep the payment for the item.
You can also if you wish, exclude Evri as a postal option on your listings, do so here:
https://www.ebay.co.uk/ship/prf/simpledelivery
@lord_darby