Somewhere a vital message has not reached you, as you do need to pay listing fees for those unsold vehicles.
Listing fees for vehicles are non refundable, payable sale or no sale, and charged the second your item goes live.
Two listings in auction format I think the fees would be around a total of £30 to pay.
Contact eBay Customer Services if you cannot see where to pay those fees, but I do recommend contacting CS first thing on a weekday morning at 8 a.m. when the lines first open for live agents, as there's more chance of Dublin answering. Explain you need to pay overdue fees but cannot see how, as your account is blocked.
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.
As said I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@tm_7588