Front Air Bag Sensor Control problems of the 2015 Chevrolet Trax

The airbag sensor for the passenger seat is not working properly. When passenger is seated the light "passenger airbag off" is shown as if no one is seated. Airbag isn't turned to the on position. This happens as soon as the passenger seats down, while the car is stationary or moving. The sensor is defective. I have been driving like this for few years now. When brought up the issue I have been told by an employe at the dealership it was because the passenger might not be seated properly. I finally insisted on having it check and turned out that the dealer found the sensor for the airbag passenger seat was in fact defective/failing. The dealer charged me the cost of the repair (as I now own the car) even though at the time when the problem started the car was still under the warranty. This problem did occur 1 year after I started leasing the car and I know now that my passenger was at risk the whole time, during and after their warranty expired. I have looked into some forum and realized other people had the same issues and were told the same thing at first (that the passenger wasn't seating right or light weight etc. . ) when in fact their sensor was/is defective.