See if this helps:
Log out of this ID account and clear cookies or perhaps use another browser, Chrome works well with eBay, and then log back into your other ID.
If you do still need Customer Services, this is the easiest and quickest way to contact CS 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.
@ja_600984