eBay

I purchased an item with the correct item number on the request for an invoice, a correct number on the invoice which I paid for in full, and now the seller is claiming that I asked for a quote on freight for a different item number and wants an extr...

Buyer and seller want to cancel a transaction but whenever I try as the buyer, I get the message "case information unavailable, please try again later". What should I do as the seller is anxious to close this matter.