Lol from what you described Jeff, that gun didn't sound like a good deal at all
if I even suspect the seller is being less than honest I wouldn't go forward with the deal
WA guns are known for being hard to find parts for, buying one that was in less than mint condition is just asking for a headache/moneypit much less the the frame being cracked requires a new frame which is a restricted part and would make more sense buying a whole new gun instead.
Best case scenario would be a refund yes, but the seller doesn't seem like he wants that as I doubt he wants that POS gun back
maybe try and get the seller to file a claim with CP for damages, but unless he paid for extra insurance, you would only be getting $100 back
but seeing as this happened last year I'm pretty sure that option is expired by now