engine blown because of warped heads

I noticed heater core had leak and heater didn't work. Took Jeep to dealer and had core replaced. Dealership said it would best to have thermostat replaced so they replaced thermostat. Total cost was 1200 dollars. Asked shop to run Jeep to make sure heater worked and they said they did and temp was normal. Drive Jeep home and noticed it was over heating. As soon as I got home I shut Jeep of and notified Dealership. Had Jeep towed back to Dealership and they notified me they would pay little over 1000 dollars and I'd have to pay roughly 6000 for new motor. I'm a100 percent disabled vet, single father and primary caregiver to my sick father. I recurve 1400 a month and can't come up with money. This is my primary vehicle and had spent the last two months at Dealership. Totally disgusted and hope Jeep will do the right thing because I've never driven it hard or abused vehicle.