Mahindra First Choice [MFCWL] — complaint on local parts being used in my tata car

Address:

Sector 5 , Gurgaon

I visited mahindra choice on last sunday (26th july) to resolve the issues and do complete service of my car.
During service, i came to know local parts are being fitted in my car like filters, shocker and alternator & link rod.
I conveyed them to use company's original parts, but they refused and said we don't go in depth of parts, what we get from our dealer, we fit the same parts in vehicle.
And even they charged double of local parts. When discussed with them, they said we got same price of all parts & same we charged to me.
This is totally pathetic.
I want to take strong action against them.