During a rear end accident on the highway when someone slammed on their brakes, I hit them at around 40 mph and slamming on my brakes to prevent it and the airbags did not deploy. The light was on the dashboard after the accident as if they did the deploy, the seatbelt blew out and will no longer retract. The front frame of the vehicle bent inwards at a 90 degrees angle puncturing the AC compressor, though the bumper has minimal damage. MA State Troopers noted that damage and allowed me to drive off since "the vehicle is not over heating or leaking", a body shop then said my car is totaled. My insurance company is investigating why/how the frame obtained extensive damage though the outer body is not as damaged. The vehicle has been parked since the accident and is available for inspection. My safety was at risk with a significant crash and the airbags not deploying, the seatbelt injured me, I am under medical treatment for injuries obtained after this accident. I have a police report, I have an insurance claim, I believe this needs to be further investigated. My vehicle was bought used in 2017 from a Nissan Dealership, it has never been in an accident with me as the owner, but my insurance company found an unreported accident from 2014 which could relate to the airbags not deploying and the frame bending so significantly from a rear end accident.