Hyundai Motor India — charging for services which are not performed

Address:

Mumbai City, Maharashtra, 400070

I am owning i20 which is my third vehicle, my earlier was i10. Completely satisfied with product quality. My concern is about the service team and their approach. Recently I got my car serviced from M/s Shreenath Hyundai, Govandi service center. It was a paid service in which I just mentioned on the brake pads worn out, that need to be check and replace if required & check on Airbag signal. As I was about to leave for Pune (from Mumbai) hence insisted that I will wait and take the vehicle. They took vehicle in around 9:00 am and returned back at 12:00 noon.
To note
• No clarity given on what are the standard services included in this paid service by the advisor. I was under assumption that brake pad cleaning and general check up is part of service.
• Advisor did mentioned that the total charges would be around Rs.6500, which he later said that it was a mistake considering it petrol vehicle.
• I received bill of Rs. ~8500 at end of service mentioning certain repair/check done by the team which didn’t happen. I was observing the engineer while he was working on my vehicle. The additional charges where brake pad cleaning, brake pin greasing, battery check, some software check, oiling, sensors cleaning, air filter replaced & few more where written on the job sheet. All these individual service costed Rs. 250 -350 . Plus the taxes which sums up to Rs.~8500
• Vehicle cleaning i.e. water pressure. I would say my daily watchman also cleans better than this service center. It’s below mark.
• My query on is tax charged over and above the MRP of spares, remain unanswered.
Now, as I have witnessed entire job activity, I immediately asked him why I being charged for the activities which are not performed. Advisor was bit confused stating that he will check with seniors.
Came back stating that we will waive off and prepare the bill.
My question is, does Hyundai has any set service procedures (apart from documentation) and are these service centres getting audited.
As I have inclination towards technicality and moreover witnessed entire repair hence advisor immediately waived off the cost.
But what about other customers who are non technical and leave the vehicles, definitely they must be over charged without giving actual service. Hyundai needs look into the same.

Now though the product quality is good but last service experience left a bad taste and will think over my next purchase.

I sent an email in this regard to Hyundai, but no response. Moreover the same Service centre calls and request to take back the complaint. Also confidently telling that no one is going to contact fro Hyundai company, and I have to deal with them only.

This indicates Hyundai's lackness towards customer centricity.