Air Bag Light On problems of the 2013 Chevrolet Sonic

When my wife rides front passenger seat air bag indicator shows air bag off. Returned vehicle to dealer. Was informed aftermarket seat covers will effect sensor and giver gm bulletin #06-08-50-009h. Subsequently removed seat covers but sensor still not working. Returned to dealership. Was informed sensor was working as designed and problem was my wife's weight (85 lbs). That the sensor was set at industry standard of 95lbs. Contacted gm consumer relations and subsequently informed to return to dealership for repair. Returned to dealership and again informed that the sensor was working as designed and given gm bulletin #12-09-41-002b passenger presence system. Again advised it as a weight issue even though the bulletin stated "the system works by detecting the capacitance of the object on the seat, not the weight". Contacted gm consumer relations again and was advised that they could not force the dealership to fix the issue. Never advising if there was even a repair available or acknowledging that the sensor is set at 95 lbs. My wife rides in my kia and daughter's chevy traverse with no issues. Just would like a straight answer and wish would have known the weight effect on front passenger seat. I know what my wife's weight was and I would never have purchased this vehicle.

When a passenger is present, the air bag and seatbelt indicator does not indicate that they are active like they are supposed to.

I have had my car into the dealer 3 times now within 5 months and they have yet to fix my passenger airbag issue. I took it in on 11/27/2015, 02/26/2016 and again on 03/28/2016. The first 2 times I was told that they would have to order the sensor for it and the last time they told me that they had the sensor but when they called me they told me that the sensor they ordered was wrong and that the sensor I needed was marked as discontinued from gm. The airbag light would stay off even with my fiance sitting in the seat whom weights a little over 200lbs and then it would deside to come on and off as it wanted. Now that I have taken it to the shop and found out that the part is discontinued my main airbag light is on and I have less than 100,000 miles on the car and I have the gmppp plan and the dealership hasn't offered me to call and get a rental, they have acted like this is not a big deal. I have a 13 yr and my fiance and myself whom is pregnant that ride in this car and it's not safe. Not happy at all!!!.