My son found a car he really liked from here and w...

My son found a car he really liked from here and we already had our financing. However, the dealership does not allow outside financing that is not in their network. I was very disappointed as I have never heard of this. I realize that this is their policy but when they were explaining why, it was not legitimate reasons. They were saying things that were not accurate and did not make any sense. I hate this for my son but we will move on to another dealership.