You need to speak to Customer Services as they have full access to your account and have the authority and means to repay any over paid fees.
I do recommend though to contact them only very first thing in the morning, when the lines first open at 8 a.m. there's more chance of Dubliin answering.
To Contact Customer Services it's a Live Chat, or you can select to speak and request a Call Back. Click on this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On the left sidebar you can see Have us Call you or Chat with Our Automated Assistant.
On weekdays lines open between 8 a.m. and 10 .m.
On weekends they open between 9 a.m. and 6 p.m.