No one here can tell you this as we are members like yourself, with no access to your account.
On eBay, "MRN" stands for "Movement Reference Number," which is a unique identifier assigned by customs authorities to a shipment when it is being imported or exported, allowing tracking of its status through the customs process; it's essentially a customs registration number used to identify and process your package internationally.
If this doesn't answer your question, you'll need to contact eBay Customer Services they have access to your account, and can explain that charge for you.
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 between 8 a.m. to 10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends.
I recommend contacting CS very first thing in the morning, when the lines first open, as there's more chance of Dublin answering.
@jiii16
