The current wait time for a callback is shown as 4 minutes.
Use this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
If Customer Services can't make any suggestions, you may have to ask somebody to help you by printing the labels and dropping off the parcels.
Even if the items are out of date, the seller is entitled to ask for them to be sent back if you ask for a return.
"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)