1999 BMW 320 Structure Problems

MY SON AND I WERE TRAVELING SOUTH ON THE 405 FREEWAY IN THE CARPOOL LANE IN MODERATE/HEAVY TRAFFIC WHEN WITHOUT WARNING THE RIGHT FRONT PLASTIC GRILL FLEW UP OVER THE HOOD AND STRUCK THE WINDSHIELD. I THOUGHT THE VEHICLE IN FRONT OF ME HAD RUN OVER SOMETHING. IT WASN'T UNTIL I RETURNED HOME THAT I DISCOVERED THE GRILL PIECE MISSING AND REALIZED WHAT HAD ACTUALLY HIT THE WINDSHIELD. I RETURNED THE CAR TO THE DEALER TO HAVE THEM REPLACE BOTH THE GRILL AND THE WINDSHIELD(THE IMPACT HAD SCRATCHED THE WINDSHIELD). WHEN I DETAILED THE INCIDENT I WAS INFORMED THAT BMW WOULD NOT REPLACE THE WINDSHIELD. I EXPRESSED MY OPINION ABOUT HOW DANGEROUS THIS COULD BE AND WAS STILL MET WITH RESISTANCE. THE SERVICE MANAGER DEMONSTRATED TO ME THAT WITH A SMALL BUMP OF THE PALM THAT THE GRILL WOULD POP OUT VERY EASILY. IT WAS AT THIS POINT I LOST...