Lose Power Steering problems of the 2014 Hyundai Elantra

While driving on 5 freeway in California my 2014 Hyundai Elantra started to violently shake like someone hitting the brake. I threw it in neutral and help my wife turn the steering wheel because we lost power steering. We got lucky and had a space to coast to the side of the road. When we got towed to tuttle-click in irvine, CA and our car turned into the service department, they basically said we are on our own to find a ride back home and no loaner car. Two days later I have to call them to find out the problem, first a technician said that it was a bad battery but that would not have caused it to completely shut down. Then a few hours later the service manager calls to say it was the battery and that is what caused it to shut down on us. After (4) days of keeping the car, the Hyundai dealership said that our battery had a catastrophic failure which caused our car to completely shut down on the freeway. I have filed a complaint with Hyundai corporate but don't know what they can do?.