I had this once and found that I had selected the most expensive form of promotion and I had paid so much far more than the item was worth before finding the ' culprit' , and deselecting that promotion fast.
Check your ad fees , also subscriptions as this is appearing monthly, in this link for your transactions breakdowns:
https://www.ebay.co,uk/sh/fin/transactions
If this doesn't explain that payment, and as we have no access to your account , but Customer Services have that access and can explain any fee.
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.
@ruuq_93