Chuffing annoying eBay sellers

[drspouse]

Two sellers, four items in total. They can't work out how to combine postage. I'm not trusting them to refund me the extra postage after paying. There's nothing else I can do, is there?

Are they auctions? I think sellers can still send invoices. Not that I've done it for years, but if you can get them to see if they can send you an invoice then our should be possible to give a postage discount from there.

They don't seem to be able to manage that either, I've sent them a link, requested an invoice, all sorts!