Brake Master Cylinder problems of the 2012 Nissan Altima

Purchased my new Altima s2. 5 convience pkg plus 1st of Aug 2012. I bought new car to be safe this was my 3rd Altima. Mon. Dec 31, 2012 @ 11;15 a. M. I made right turn into home driveway. My driveway is steep house sits down was proceeding forward down driveway to enter garage. I had brakes no warnings or indicators anything was wrong. Top of drive had brakes on, then let off little to allow car to go forward. As I eased off liitle on brakes down car started to accelerate to fast so tried to apply pressure to brakes and went to floor, started pumping brakes and nothing car would not slow down to avoid going through garage door or side of house veered to right steering was little tight all could think was keep pumping brakes! car went off embankment airborne landed on neighbors driveway empact shook me. Car is proceeding through their backyard still pumping brakes no results I see huge tree headed for frantic to stop car next I know I am dased airbag deployed car is on drivers side up aganist tree see smoke coming out front. Ema had be pulled out backseat through passenger side. Car went off 6' striaght retaining wall tires pulled cinder blocks down kept me from head on tree. My brakes failed person towed my car while incline said had no brakes, but body shop said have brakes they're not going total car or check master cylinder $13,000 damage it can be repaired, but can't drive this car it is not safe for me. My brakes failed. I bought new 2012 Altima my 3rd one, car 4 mos. Old 4,000 miles this shouldn't happen. Learned recall sent out 2012-2013 power steering bolts. I had go by ambulance to er I have been hurt. Nissan making me gather info send to investigate if defect. Taken so long ins gives rental car 25 days Nissan won't provide one until through investigating for defect which hasn't statred. My car is not safe and I have prove to them. Your car should not hurt you!.