I had the opposite experience with a seller. I purchased a part out G5 Quad which ended up not being a quad. Upon informing the seller of the issue he offered to refund the purchase price but not the shipping amount (which was more than the purchase price). This was unacceptable to me because he advertised it as one thing and it turned out to be something else.
I informed him I would be forced to use Ebays buyer protection if he didn't refund the entire amount and, that by doing so, he would be responsible for the return shipping. Instead of cutting his loses he refused forcing me to use the buyer protection.
I know some sellers want the item back to ensure that buyers aren't scamming them but since this was a parts only sale for little money (I think I paid $35 for it) there was little for him to lose by letting me keep it.
I had one experience a few months back where I ordered some lightning cables from a vendor in Florida that I've used before. I like their cables, unfortunately now I won't buy from them.I'm loathe to leave negative feedback or complain to eBay's customer services dept because most problems should be resolvable with just a little bit of decency and compromise but it seems that's beyond some people.
They appear to lack the self-awareness to understand that it's in their best interests to reach an amicable agreement with the buyer but instead they prefer to play unecessary games and ignore messages.
It's really short-sighted behaviour on a practicality level alone because when I had a similar issue to yours a couple of years ago, someone at the UK call-centre informed me that whenever eBay has to intercede with buyer protection, the seller's cards are effectively marked.
Shipping was free and my package was out for delivery. Suddenly it changed to customer pickup. Now the PO for me is 30 minutes away. If I go there, waste no time and return directly that's an hour of travel time. There's only one reason why the package should suddenly change to customer pickup when it's out for delivery and that's because the package had insufficient postage. So not only would I be wasting an hour, I'd have to pay the additional postage for 'free shipping'.
I don't like this brand of cables THAT MUCH. So, I messaged the guy and explained this. I managed to get the PO to 're-deliver' the package. A week, week and a half goes by and nothing happens. No package. So I told the guy this time that I wanted a refund. He files a claim on ME with eBay!
eBay gave me a courtesy refund and you know what? Within an hour that package MOVED. It went back to Florida, but it moved. If you advertise free shipping then you gotta pay the charges - not me.