If you cannot change the tracking yourself, contact eBay Customer Services, and they'll change the tracking for you. Their lines are currently closed but reopen at 8 a.m.
This is the easiest and quickest way to contact eBay Customer Services from the link below, for a Call Back option. I do recommend contacting CS very first thing in the morning when the lines first open, as there's more chance of Dublin answering
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.
You cannot ask a buyer for more money as they pay the postage cost you select on the listing for the item.
@hitwoman2