2021 Tesla Model 3 electrical system problems

After parking and leaving the car, I realize later the dashboard did not shut down. The dashboard was still illuminated, and I was also able to hear the sound from a tuned FM radio. I re-open and closed both the driver and the passenger doors in an attempt to shutoff the dashboard. Since I did not get the expected result, I decided to get back into the car. I sat down in the driver chair to investigate the problem when the car was instantly activated and switched to a sudden and uncontrolled acceleration.

The contact owns a 2021 Tesla Model 3. The contact stated while driving approximately 25 MPH as he was exiting a highway and slowing for a traffic signal at the bottom of the off-ramp his brakes failed to engage. The contact stated the brake pedal was stiff and he had attempted to use full leg force to depress the brake pedal. The contact's vehicle ran the traffic signal and the contact stated he hit the right front end of a vehicle that was across traffic from him.