Replacing coolant sensor?

I took my truck to get the coolant gauge fix because it’s been two months driving it with it not reading. Therefore, they fixed it they said but when I turned it on the gauge didn’t rise so, I thought it was new so it take time to get the routine going driving it I started to see smoke come out of my truck I pulled over turns out it over heated and the coolant pipe burst. So, now the place I took it said they put the parts new, and it worked but my engine is out. That I need a new one. Something here doesn’t seem right to me, so I’m asking this for that reason.