As you cannot contact a ' No longer Registered User' , you may not be able to open a case for item not received, and may need eBay Customer Services help here to open a case or just to fully refund you, as they have removed the seller from their site.
The easiest and quickest way to contact Customer Services is through this link, for a Call Back .
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On weekdays lines open between 8 a.m. and 10 p.m. - 6 p.m.
Weekends lines open between 9 a.m. to 6p.m.
@reynchri-fz3b8au