My car went into the shop and had the water pump and thermostat replaced. 2 days later, my car blew up due to thermostat housing unit what do I do now

I took my 2015 Chevy cruze into a small repair shop in Perrysville, OH to have the water pump and the thermostat replaced. Not even 3ndays later I was driving on 71 in the fast lane when my car shut completely off. My engine had blown up. I had to have my car towed home, then, had to have it towed to the dealership the following day. the dealership told me the housing unit for the thermostat had broken, which caused my car to overheat, which then, caused internal damage to my engine. Estimating my repair cost to be that of $5000.00 or more. I just paid this mechanic to fix my water pump and thermostat not even a whole 2 days prior, and was charged approximately $475.00 . I was explained to that the cylinders on my car should have anywhere from 174 PSI to 204.1 PSI. I have 4 cylinders and cylinder 1 was 50 PSI cylinder 2 was 5 PSI cylinder 3 was 25 PSI and cylinder 4 was 50 PSI. And my car wouldn't have over heated if the housing unit wasn't broken.