A seller cannot remove themselves completely if they have current transactions, but eBay can, if the seller has broken some selling regulations.
I suggest then to contact eBay again, but do so only very first thing in the morning when the lines first open at 8 a.m. as there's more chhance of Dublin answering. If eBay have removed the seller then Customer Services need to open a case for you for the return of your money.
To Contact Customer Services it's a Live Chat, or you can select to speak and request a Call Back. Click on this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On weekdays lines open between 8 a.m. and 10 p .m.
On weekends they open between 9 a.m. and 6 p.m.
@alandu