Hyundai Motor India — Overcharged for car service

Address:

New Delhi, Delhi

Sir. I have done 1st paid service of my Hyundai i10 magna 1.2 (DL3CBP 8905) from Elroy Motors Pvt Ltd Okhla on 12.04.2015. They have charged very high prices for their products and service. For 3.6 litres Engine oil, they have charged Rs. 2400/- and for lubrication of 4 doors, they have charged Rs. 401/- in which they have put only few sprays and Rs.1500/- for Engine Decarbonisation, which are not justified. They have charged Rs. 1355 for their labour for paid service and for cleaning different parts, they have charged separately for labour cost. How they can do this?. I am feeling very helpless. Please help for the same.