Tata Motors — brand tata hexa 4x4 xt

Dear sirs i have bought a brand new tata hexa 4x4 xt model from concorde motors akhshardham delhi
I am majorly disappointed as i have been handed a faulty tata hexa in which the 4x4 switch does not work. As soon i took delivery of the car the car goes into auto mode on its own and all other modes are disabled. We get a message on screen of hill assist failure electronic traction failure and some more masgs
In addition to this the rear window beeding was damaged as well as the passenger side ovrm the paint was scrapped.
I was sent to the service centre the next day for software update and surprisingly the computer was not working. Today i am at saga service centre noida where no one is being able to identify the problem. It is surprising that no trained staff is available anywhere to handle this issue. The staff has told me they will try to change the brake switch and check if it is resolved else they will have to open the hexa to check what is faulty and they do not wish to open a brand new car.
It is an expensive car and i want tata to deliver me a perfect product. I would not want to settle for anything less than a replacement hexa. Why would i wish to buy a brand new car which goes for extensive service the very first day. I am very scared. I bought this car to travel to the hills using 4x4 option but am seeing issues in a brand new car. I also wonder what sort of inspection did the car go through. I wish to send this complaint to the highest officer at tata motors and get my issue resolved urgently