Where do I go ????????

What shocking service 🙄 I have a brand new Nissan Magnite. When I first complained about my brakes making a noise we were told don't worry it will get better. After having my vehicle for a couple months and I phone to book vehicle in for brake noise, sometimes no brakes, and aircon not working properly I was told to take it back to Nissan Sandton. Only to be told by Nissan Sandton I can take it to my closest Nissan. So I'm still stuck with noisy breaks, aircon doesn't work, the car struggles to detect the key card and shout half the day that it can't detect the key, I stay in Centurion to get somebody to drop me in Sandton is difficult who do we contact?!!!!!!