Contact Ebay Customer Services - link below but they are not open yet, I think it's 'real people' from 9am on the weekend.
Remind them this is not your responsibility under the Global Shipping Ts & Cs and ask them to close the case and deal with it. (Nicely, of course!)
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)