Brake Light On problems of the 2017 Hyundai Azera

Car was driven on highway w/ 1300 miles on it (brand new lease) with no traffic around vehicle when front end collision warning alert and electronic power brake alert lights came on; once able to get to a safe stopping area (parking lot), car was put in park and owners manual reviewed to see what the warning, alert lights & sounds related to. When attempting to put into gear the gear shift would not move from park. Called dealer ~ was told to shut off car and try again as "sometimes this can happen if too close to a car or if it is raining" (neither applied) but car went in to gear then driven to destination. Two hours later back in car getting on entrance ramp of highway and pick up truck in front of mine slammed on brakes, I hit brakes & hit pick up truck hitch. No warning system came on, no alerts, no lights, no front end collision warning brake system took affect and not even sure if brakes engaged. Car was towed to dealer after service hours, by morning they sent car to collision shop and it has sat there for 2 months now. Contacted Hyundai motor corp to file complaint and see if this system failed as this is a brand new car in my possession for a mere month. Inspector was sent to check system diagnostic codes etc and report filed to Hyundai; they claim they were unable to find malfunctions or defects that would have caused the accident as I "allege", yet there are diagnostic trouble codes. Upon receiving this information I asked to see the report and was told no I can't ~ what is Hyundai motor America hiding? why am I not entitled to see the report of what is wrong with my car? how do I know this is not pertaining to what led up to a car accident when earlier in day that system activated unnecessarily? the dealership and its sister dealership were told not to accept car for service evaluation, really?! why and by who would they deny this car service check?!.