A parrot

We just bought a 2014 silverado last Wednesday. It wouldn't start on Saturday. We jumped it brought it in and they said there was nothing wrong with it. We brought it home again went to start it in the morning and its dead again. We towed it to the dealership where they can not find anything wrong with it. The truck has 180 miles on it. Which have basicly been used up driving to the dealership and bringing it home from the dealership. The dealership is 50 miles from our home.