Apple India — display and camera issue

Address: Mumbai City, Maharashtra, 400062

I bought new iphone 11 and i felt that there is a problem in the camera. I went to the store and check that with the display phones placed over there it was completely visible that my camera was having problem and the brightness was low as comparative to the phones which were in the display in the apple store.
I complained about it they send me to the service centre and then service centre took one day to find and then returned phone back to me saying that there is no hardware and software issue, there is only cosmetic problem so we cannot do anything i have reached to applecare they also said that there is cosmetic issue we cannot change the phone what has to be done now i don’t understand it is rs.70, 000 phone and they are not replacing it i have shown them the pictures in which it was clearly visible that my phone was having a major problem still apple haven’t resolve any issue and now i am in problem. Such a big company and such a irresponsible behaviour.