Then it is too late, now.
The device is already damaged.
You gambled nothing would happen to this expensive iPad and you lost that gamble.
This is why the device was returned to you and your payment refunded.
It is notoriously difficult to prove a screen crack is a manufacturing defect and covered under the free, limited, one year AppleCare ( NO + sign ) manufacture warranty.
Apple does NOT actually repair iPads.
Apple ONLY offers in/out of warranty device replaement.
You will, probably, have to pay, approximately, 60% of that iPad's original cost, to obtain another replacement device of the same year and model.
Sorry & Best of Luck to You!