Air Bag On-off Switch problems of the 2008 Acura TL

I own a 2008 Acura Tl type-s and the dashboard on the passenger car it completely cracked. It has only been serviced at Acura dealerships and I take extremely care of the car. I always use a sunshade and the official Acura Tl's car cover to protect it from the sun. I notice the initial cracking on April 25th, and it was about 6-inches long right on the passenger's airbag. At the time the car had less than 79,000 miles. I made a complaint to the dealership about the evident defective part. It took them a month to get back to me with a negative answer. According to them, it will not affect airbag deployment and the only solution is for me to pay $1,600. 00 for the replacement. However, no checks or studies were done to the car to determine this. I did my research online, and this happens to hundreds of Acura Tls. Therefore, it is obvious that this are defective parts. I do not think that anyone paying for a product should have to pay thousands of dollars a few years later, due to lack of quality of that "premium" product. I would think that after gm¿s recent lawsuit regarding a small ignition switch, which has caused death to several people, Acura would take more responsibility about their cracked dashboards along the airbags.