Mechanic’s Error?

Okay. My car has been overheating so I took it to a mechanic, and he said that it was the water pump that got the vehicle back. I thought there was no more need for water jugs being toted around because it was fixed. The next day on the interstate it starts to run hot. There’s no shoulder and I couldn’t stop, and it took a while for me to be able to exit the interstate to stop. Fortunately, it didn’t crack the head or anything like that, but at that point, I had to get the car towed back to the mechanic's shop. So, then he tells me it’s the thermostat and the thermostat housing that he needs to replace. Did that now the car is running fine not overheating or anything like that but the bill is $725 plus I have to pay for towing and I feel like if he would have diagnosed it properly the first time I wouldn’t have to pay for towing at the least, but I’m not sure I just want to be fair. I just want y’all‘s opinion. Thank you.