Traveling Alone Day 3 - Car Problems Will Ruin You Financially

What's Happened: I just spent $1600 at the Chevy dealership to get my car fixed. They told me they fixed all these break lights, engine lights, and security lights that were coming on; which is weird because I NEVER had those lights come on myself prior to coming there. Anyways, I asked em so this car is good to go then, it's gonna get me there? They tell me the cars good to go. 30 or so miles go by, car shuts down again for the same exact reason. I call a tow truck, it's going to be $300 to get it towed back to the dealership. I get there and they tell me well it could be a bad mass airflow sensor and that it would be $600 to fix that. I asked them they can't fix it for free? Or reimburse me for the tow back because they said my car was good and it wasn't? They told me no and asked if I wanted to trade it in. Said they'd give me at most maybe $1000. I'm going to sleep..