Just make sure your details here are correct.
https://ppcapp.ebay.co.uk/myppc/wallet/list
If they are not, contact eBay Customer Services who have access to your account and can help you further here, at least pay those outstanding fees.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@3452xxtea