Use the link to contact Ebay Customer Services.
I assume you added the tracking on Ebay so ask if they can check the tracking confirming delivery.
As long as the delivery was more than 48 hours ago, they should release your payment.
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)