TL;DR: dodgy seller made offer that they can not fulfill,causing loss to buyer, and Ebay is not protcting buyer from that.
I purchased a 4tb 860 evo SSD from BPC Technology eBay( a.k.a Budget PC) in a recent deal https://www.ozbargain.com.au/node/611605 .The next day they contacted me and said the item was oversold due to an ebay system flaw.Then they offered to replace the order with an 1tb modol and pay a partially refund. I said yes becasue eventhough it was not the best deal on eaby atm, I really needed a new ssd and wanted to get out of this oos shit.
But two days later, they called me again, claiming they can't do a partially refund, and require me to pay $169 to their paypal account (which is absurd), or to place a new 1tb order before they can give me full refund. But because the Afterpay promotion had ended and the ebay gift cards I used to pay was still held by them, I refused to do so.
Now after another two days, the 1tb ssd has arrived ( in a padded bag), and no further resonpse from them. The way ebay handles this is just let me return the item and get refund like nothing ever happened.
IMO, it's the seller's responsibility to deal with ebay no matter it's about stock number or making refund. now that their irresponsibility has caused a buyer's loss in time and opportunity cost, and they can simply walk out from it without any punishment?