Toyota — unnecessary spare parts change

I went into palace toyota mysore because i was getting a coolant overheat warning. They made us wait for over 4 hours and said they needed to replace the radiator. On replacing the radiator, they said the issue is with the coolant reservoir. I decided to not do the repair because the work didn't seem professional and they were forcing me into buying the spare parts.
On returning the old radiator to me, i took the same and showed it to 2 different mechanics, who said there is nothing wrong with the radiator.
It was a complete waste of my time and money. I have 2 perfectly functioning radiators and still a broken car