2018 Tesla Model 3 seat belts problems

I was at a stop at a red light and was rear-ended christmas eve night, causing my car to be pushed into the vehicle in front of me at the red light. I remember my abdomen hitting the steering wheel and complaining of stomach discomfort immediately following the accident (I've since gotten x-rays and will need 12+ months of chiropractor therapy). I noticed a burning smell inside the cabin, similar to the smell after firing a pistol. I figured it was the airbag, however, there was no deployment of an airbag.

Right before the car hit the 50,000 miles full warranty, I called tesla and reported 2 safety issues. The first was the horn not working and the second was a seat belt safety warning. Tesla moved the appointment and when I got their, I have exceeded the 50,000 miles. The technician at tesla's facility understood that I called before the 50,000 and that it is tesla's fault I did not get the service on time.