The seatbelt chime started getting louder as it chimed. The engine sounded as if there was a sirens in it. I turned off the car and it stopped.
Well, your dealer service department should be open in the morning, you can have your concerns addressed under your warranty.
BTW, was the seatbelt chime after you put on your seatbelt?
Because it wants you to put your seatbelt on.