The shower handle in my second bathroom was broken. I couldn’t adjust the temperature so I was taking really hot showers. I called a plumber. The guy looked at it for 10 seconds (literally) and quoted me $450 for the repair. He wouldn’t tell me what part was needed or any details on the repair. He wanted me to trust him.
I called a second plumber. He actually spent some time and disassembled the unit. He talked a better talk and quoted me $350. Still no details on what was broken.
He was slow to get the part he claimed I needed, so I looked up the details of the unit I had and found the installation instructions. I spent 1 hour and I fixed it myself. I didn’t buy any new parts. Nothing was broken, it was just assembled incorrectly.
I’m sure 99% of people would have paid the money.
Lesson: do research and be a savvy consumer. Whether it’s a big purchase like a house or car, or something small like a home repair, know exactly what you’re paying for and fight back if you’re not getting the answers you want.