There isn't a phone number too call, it's a Call Back option .
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.
Or, better still as there truly is little reason ever, to call CS, come back to us explain the problem you're having, there are many very experienced members here happy to help you.
@christinelefever