My brother was trying to set my clock and pushed something and now my radio stops as soon as I put the car in reverse. Help!!

It's been a long time since I had a car that you had to turn the headlights off manually. What's up with this.

2013~ car stalled on idle, idiot light on. Started back up~ went to dealer. They said they replaced fuel pump. One week later, same exact stalling...idiot light.. took back to the dealer. What's up with this car? Dealer said they are not in the business of replacing parts and want their loaner back...they can't recreate stalling. What should I do?