I had the same problem. I emailed AtVanilla and they apologised profusely, suggested I keep the inferior puzzle and offered me 5USD discount (the original puzzle cost 34USD). I told them this was unacceptable and they increased their offer to 8USD, I said no way, I want a full refund, They said OK, but our Ts & Cs mean you have to return the original puzzle at your expense, and you probably won't want to do that because it's very expensive. So I called their bluff and sent the puzzle back to the address they supplied and got proof of delivery. No sign of a refund, so I opened a Dispute on PayPal and then upgraded it to a Claim. The seller eventually offered 50% of the purchase price which I rejected. They then requested I send the original package back (huh ?) to a different address from the one I had already sent it to. I had to remind Paypal that I had already sent it and it had been delivered. Paypal eventually reviewed the case, decided in my favour, and refunded the full purchase price. The whole process took over 2 months, I'm sure the seller expected me to give up along the way, but I don't do that. Sure, I had to pay for the return, but I still ended up better off than had I accepted any of their ludicrous offers, which probably wouldn't have materialised anyway.
There are any number of jigsaws offered on FaceBook and elsewhere right now, presumably as a result of lockdowns around the world, Most of these originate in China, and most are scams like this one.
