Check if the item is still in your Purchase History, perhaps use a PC / laptop with Chrome that combination seems the most reliable.
Check also My eBay >> Bids / Offers see if that gives you any clue.
If it is not in your Purchase History, the seller may have cancelled the order?
It's bad selling but no one can force a seller to send out their item. Did it perhaps reach a very low price? Again the seller's fault here for not setting the starting price to one they wished to achieve.
If you receive a cancellation message you can if you wish contact Customer Services explain you did not authorise this cancellation and they may place a damaging defect on the seller's account.
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.
@adka-7734
