Warped Engine Block?!

I have a 4-year-old Pacifica brand new off the lot. Now has about 67,000 miles on it, of course, just past the manufacturer’s power train warranty. At the 4-year old mark almost on the nose, without any previous issues, the check engine light came on & the car was running “rough” while in idle. Garage identified “head gasket issue.” We brought it to the dealer & filed a claim with Chrysler in shock this could happen to a 4-year-old car. Dealer has had it for a month now & diagnosed “warped engine block” and “needs new catalytic converter due to warped engine block causing coolant to leak into engine cylinder.” Has this happened to anyone?? It was a brand new minivan purchased at a an authorized Chrysler dealership. I am told $10,000 worth of parts & labor work, with a month backlog on parts. I am lost and angry!!! Any suggestions??