We are members like yourself , and have no access to your account or messages , to be able to answer you correctly as to your next steps here.
You'll need to ask Customer Services.
Contact them through the link below, it seems to be only an automated chat no Call Back option if using a desktop browser, but others have found a Call Back option on the app or mobile browser.
https://www.ebay.co.uk/help/eua?id=5190
@fari_2028