Brake Drum Wheel Cylinder problems of the 2010 GMC Acadia

As car was accelerating to 30 mph in a lane of traffic into a turn, I heard a loud noise. Then, I couldn't move the steering wheel. I tried to pump the brakes, but the car did not stop immediately. I had no control over the steering, and the car eventually stopped in a parking lot. I was petrified. The radio was still on, and the key was still in the on position, but the key could not be turned. GMC simi valley says the problem was a rod to a cylinder that snapped, and was not due to an ignition problem, or related to a current recall. The whole engine needs to be replaced, almost the value of the car, given its current resale value. I would like to request an investigation into another recall event.