Brake Master Cylinder problems of the 2012 Chevrolet Camaro

My 2012 Camaro had a leak at the master cylinder resovior!one dealer where I bought it cancelled my appoitment and said they would mail me a cap!I refused as this would void the warranty!took to another dealer and they confirmed and replaced cap!about 10k later the brake petal went to the floor and lost my brakes!dealer ordered a new resovior and replaced it!took car home and foor kept going to the floor!brought car back abd dealer said it was fine. They refusd to let me speak to a tech or service manager!brought to another dealer and the called gm. There was no brake pressure and no warning lights on!they took off master cylinder and rebled system!less than 100 miles later I went out to start car as I been sick and didnt want a dead battery and foot went right to the floor!I opened hood and resovior was soaked and brake fluid sprayed onto the positive jumper cable,leaked under master cylinder and you can see that there was a spray pattern directly from the master cylinder!fluid is being forced out and air being sucked back in!car will be towed back to dealer!last time they claimed previous dealer over filled resovior and thats why there was no pressure!a slightly as they said overfilled master cylinder will never cause a no brake pressure issue!sounds like they were told what to write by gm legal department!front brakes also grind when there is pressure and causing rotors to be grooved!so sad that they dont care that this is a life and death issue!.