You could contact Customer Services but I warn you now that it's usually a chat bot who answers and you need a real human here to remove that damaging feedback reducing your % score.
All I can suggest is using the link below, and use a mobile phone / browser / app, or if Mr. bot appears keep entering I wish to speak to an agent , over and over, that sometimes works.
Try tomorrow at 8 a.m. as there's a chance of Dublin answering, here's the link for CS
https://www.ebay.co.uk/help/eua?id=5190
@properbargain