You're totally right Lagaffe; if someone wanted to return one of my items because of a genuine fault or it not being as described e.g. I sent the wrong item or something, I would fully expect to cover their costs of return, and would probably throw in a little freebie with the replacement order to compensate them for the inconvenience. It sounds like your seller is just plain dishonest. Problem is I think even if you open a dispute with PP they won't refund your postage, although others on here may know otherwise. Although I think I'ld pay more than £8 NOT to have to try to sort a problem out with PP or Ebay. :lol: Now that can seriously drive you bonkers.
I'm currently dealing with two buyers who have genuine problems, and my problem is getting them to reply. One didn't receive the item. So I offered him alternative items and have lodged a claim with RM. But then he takes a week to reply, and by then the replacement item he chooses is sold out, so then I explain the current alternatives, and no response. Ditto, a man who bought an item from my website that had in fact sold out and I hadn't updated the website; my fault entirely, offered him a choice of the available alternatives, or refund, no response. I think I'll just refund them both with a note suggesting they just reorder what is on the website if they wish.