Power Steering Light On problems of the 2013 Mercedes Benz C250

I have been having constant issues with the steering and airbag lights going on. I was also in a bad rear end wreck in 2016 and the airbags did not deploy. I have been calling santander consumers about the issue and they don't care and are still making me pay my more. The mercedes dealer has said that the recalls are pending and they do not have the parts to fix the issue. So I have stopped making payments because I have a toddler and will not drive a dangerous car and the car was recently repossessed last week. The airbag deploy lights constantly stay on indicating they are not working and the steering keeps locking up. It happens when the car is parked and in motion.