I'd find a different supplier.
I ship eggs often and in the warmer months the buyer always have better hatches when they don't let them set. I know it's probably against everything you read but that's my experience and it makes total sense. Also I don't know what kind of incubator you're using...
I'd add when hot I wouldn't let eggs rest fora day on a cold air conditioned counter after being shipped in temps that could have been warm enough to start embryo development
No they were old. Impossible for them to rot within a reasonable amount of time to save for hatching. You should be refunded. The shipper knew exactly what they were doing I'm my opinion.