Car Will Not Start problems of the 2011 Buick Enclave

My car would not start on it own. I got a boost and it started up. Went to auto store and turned the car off and removed the key but it kept running for a few minutes. The sales associated tested the battery and said it wasn't getting the proper crack amps. They did not have the battery that I needed in stock, I was able to make it home and turn off and restart the car until the next morning and the car would not start again and the key got stuck in the ignition. My husband purchased a battery from advance auto but he was still not sure that the battery was indeed the issue. Called and took the car superior motors dealership on November 5. We left the car for them to research the issue. We received a call notifying that there was a crack in the firewall that caused water to leak at the cowl area which shorted out the fuse block and corroded the connectors. My husband asked if we could get assistance with the repair because it was a defect in the product/workmanship and not something that we had control over. Superior motors informed us that we needed to reach out to general motors directly in order to receive any type of assistance. We spoke to several customer service representative that took all of our information and assured us that the issue would be escalated and a call within 24 hours. In the meantime, we reached out to our auto insurance provider and they went out to the dealership. He notified my husband that a service bulletin has been issued in regards to the issue with our vehicle. I am disappointed because we were without transportation and had been promised several call backs. After numerous attempts of speaking with customer service agents we finally received a call back from a nicole on November 23, 2015 informing us that gm would not be assisting us. We were told by the dealership that we are lucky the car did not catch on fire.