Brake Drum Wheel Cylinder problems of the 2012 Nissan Versa

Randomly one day, I went to brake, it failed to slow down or stop my car, freaking out I pumped it and then it stopped by the 3rd try and jolted. It has since been doing that every day. We've replaced the master brake cylinder, that didn't work, took it to the dealership, they said it was the break and rotators, replaced those, that also didn't work. There are no leakages, the hose is fine, and brake fluid is great. I have a another appointment with them to have a tech ride with me to see what I am talking about. But this isn't safe and I've been driving like this for 3weeks now and fixed everything I was told it could be, wasting my money, and it's still not fixed. Miles are 130,000ish. I drive it mainly on the highway to get to work, for an hour there and back.