You need to send photos to the hatchery you got them from- I also think you got the switchero- probably a silly accident- but unfortunate for you, as you wanted egg layers. You need to look up ASAP care for cornish x, as they have special feeding needs. IE, not letting them eat all of the time, and a often a different food than standard chick start. No perches.
Push on their beaks- if they are flexible & rubbery- you may have ricketts (aka calcium or Vit D deficiency) this would make soft beaks that are easily broken (legs too).
Feathering on meat birds usually looks pretty bad- they are bred to put all of their energy & growth into meat, not nice feathers. Sudden death due to heart problems is also common.
Also either start planning for processing them, or find someone who might want to buy them for processing if you do not want to.