2021 Tesla Model S brakes problems

It is still unknown, but I believe the brakes failed. My wife was driving and making a left turn into a residential neighborhood when she applied the brake and it didn't respond, even when pushing the pedal to the floor. All that resulted was a clicking noise. The brakes failing to respond, and the emergency braking not engaging did cause an impact with a curb and sidewalk. At the same time, the seatbelt did not lock on impact or when pushing the brake pedal to the floor.

Driving on highway at 65-70 MPH with auto pilot and speed control engaged. Went to change lanes from left to right. Put on turn signal, cancelled auto pilot by turning steering wheel to right and moved to open right lane. There were no vehicles around us at all. The car suddenly, unexpectedly, and very shockingly slammed on the brakes causing items to be tossed around in the car, engaging all of our seat belts with some discomfort, and sending some loud alarm or warning sound to go off in the car.