Brake Abs Warning Light problems of the 2012 Toyota Camry Hybrid

On Friday the 20th of September, I took my vehicle to queensboro Toyota in NY to change my oil and check why my brake abs signal hazard lights were on. The oil was changed and I was told "nothing is wrong with your brakes" and the signal was removed. On September 24th, I almost got into an accident because my brakes failed on me, so I returned the vehicle for a 2nd diagnostic. I was then told "who ever changed your oil, they put the wrong brake fluid and it damaged the brake system. My brake fluid was never changed because I have a 2012 new car and it is unnecessary to change it now. I tried explaining my issue to the supervisor of the Toyota service department and I was told to do my own investigation on the contamination of my brake fluid. The history of the vehicle shows queensboro Toyota performed my maintence, so I hold them responsible. Please help me, I am an honest consumer who can't afford to spend unnecessary funds for an issue Toyota can resolve that almost caused me an accident with my 3 daughters on the highway.