Driving teachers are skilled people from various countries. I would respect them as teachers.
Did anyone care to check if they are getting deserving salary? So management think they will pay a small salary and let them make enough by squeezing from students.

If they are given enough salary and still they are doing the same, then you can blame them. My teacher was a nice gentle man and he didn't ask for anything. He was the best teacher ever.
Kindly try to see from both sides.