Engine Knocking Noise problems of the 2017 Jeep Patriot

I bought a 2017 Jeep Patriot in Feb 2017 from lee auto mall in April 2018 the motor blew with 48,000 miles on it while I was driving out of work on a city street. It was replaced under the manufacture warranty April 2018. My check engine light came on again January 2019 making a knocking noise. Brought the truck in to the Chrysler shop to have it looked at. I was again told my motor they replaced not even a year ago was blown. The piston and rods were bad and was no longer under warranty and it would cost me 7,000 to replace the motor. This is a 2017 Jeep Patriot that is now on its 3rd engine in less than 3 years. Chrysler nor charlies motor mall Jeep will not help me in any way and say that I need to pay 7,000 dollars to have a new engine put in. The first engine only has 48,000 miles on it when it blew and the second engine they put in only had 55,000 miles on it when I was told it needs to be replaced again.