Well that's rather sucky and greedy of them. MyPetChicken refunded the entire price or sent new pullets at no charge. It would pay to learn the policy for sexing errors before one orders from a hatchery.
Even then, sexing errors, even if you are refunded the money, is a major headache when you're stuck with unwanted cockerels. I finally decided to hang up the game of gender roulette and only buy auto-sex or sex-link breeds. I just hate that period of uncertainty and dread between getting new chicks and finding out if they are the sex I had counted on.