How'd you manage to get a refund? Via the seller or via paypal? The seller told me if I sent them back he would give me a replacement, but obviously that would be bogus too. I contacted Paypal but they were most unhelpful
I filed a claim with Paypal and through the claim notified the seller that I had a defective SD card. I described the problems I was having and politely insinuated that this might be a bogus card.
My guess is that the seller refunded my money because at that time they had 100% feedback. To keep me happy they gave me my $15 back. They didn’t even want the card back (imagine that).