Capital Hyundai — service

Address:

Capital hyundai Sector 63 noida, Gautam Buddh Nagar, Uttar Pradesh, 201301

I have been charged for labour charges on every part while the cost of parts on my service was 4k the cost of labour was 6500 making the service a hugely expensive affair. When asked the executive to explain these charges he was not aware of the details and looked very submissive.
I dont understand that how can capital hyundai sector 63 noida can charge labour charges according to their will.

I want investigation on these charges and they being reversed.