Poor Aftersales Service

Bought a brand new Magnite at their dealership. From first service to second service, I asked them to change the squeeky, noisy brakes. They kept on telling me they will get better with tim, now they are worse and I feel like they are unsafe. I am even thinking of getting rid of the car and run away from Nissan products. They can't resolve simple brake pads issues. What if I get a major issue?