Dealer possibly damaged my engine, how to proceed?

Hello,
Just looking for some opinions here. My 2010 Prius had an accident where a piece of rebar jammed through the radiator and the AC condenser.

After having my insurance company work on it, they sent it to my local Toyota dealer to have the water pump replaced and whatever computer update they couldn't do without the dealer software.

Dealer installed the water pump but incorrectly installed a fuse. When the insurance shop went to test drive the car, of course it stalled out and died because the water pump was not working. They sent it back to Toyota and I was told they "incorrectly installed the fuse" and that's why it stalled out.

Fast forward to a week later, the car had a massive head gasket leak. I had to replace the engine and my mechanic who did the work said their failure to install the water pump caused the engine heads to seize and break the engine due to a massive leak of coolant into the combustion chambers because the car overheated and went into a fail safe mode.

Dealer contends the car had a head gasket leak before and any damage was already done. (Car did have a minor head gasket leak at about a few mililiters every 1,000 miles but it was drivable, after they messed with it the car was undriveable).

My question is, was there any other damage potentially caused by them installing the fuse incorrectly?





SM-N960U ?

 

Failure occurred at approximately 110000 miles immediately after the dealer install the water pump incorrectly. The original leak I cannot tell seems the car always had it? I bought the car with 40,000 miles

SM-N960U ?