Brake Squeaking Noise problems of the 2015 Nissan Altima

I bought our 2015 Nissan Altima s brand new from fenton Nissan east, in del city, ok, in less than a year, the brakes starts making very loud squeaky noises, whenever the car is in motion, and I apply the brakes. I took this car to have it looked at, at hudiburg Nissan dealership, oklahoma city, ok and they did something to it that got rid of noise for a week, then, the high pitched noise came back, when in motion and I apply the brakes. A little later, I took my car to fenton Nissan east dealership in del city, and the service woman said "I have lots of customer complaints about these Nissan Altima cars and there is nothing that can be done but switch out the brake system and replace it with another. She said it would cost me $400. 00 or live with the noise. " I believe this is a hazardous issue that should be fixed before someone gets killed because the brakes are not working properly. Today, December 14, 2017 the high pitched noise is pretty constant, whenever I drive the car and apply my Nissan Altima s brakes. God forbid, that I ever have to apply my brakes quickly. Yes, I am afraid that my brakes will give out, in the event of an emergency.