Contact eBay Customer Services explain what has happened and they should provide the correct level for you if it's for a case of item not as described, and you're still in time to open this case, that is, within 30 days of the item's last estimated date for delivery.
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 between 8 a.m. to 10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends.
I recommend contacting CS very first thing in the morning, when the lines first open, as there's more chance of Dublin answering.
@tgw567