This is very bad selling , whilst no one can make a seller sending out a winning auction item, you can report this to eBay, and they will place a damaging defect on the seller's account. It doesn't take many of those, to remove a Private seller from the site permanently, eBay do not like disappointed buyers.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@keitmorga_6