Trident Hyundai, Bangalore — car servicing was damaged the car

Address:

Bangalore, Karnataka, 560000

I gave my hyundai Grand-10 for servicing yesterday(14th Sep 2017) in indira nagar service center after the trident hyundai service call center calling me a hundred times. They took my car early in the morning and promised to get it back my 12 PM.I finally got my car around 8 PM in the evening by calling them multiples times with the car Boot (dicky) light on. I tried a lotz to switch it off but doesn't work then i took my car to the local mechanic and they disconnect the connection. As it was working perfectly before giving it for servicing . They screwed up my car. No proper cleaning, Back gear was not working properly nothing has been done and for free servicing also they charged 2500 rs unnecessarily. I am not sure now how to fix that boot light issue now.