Williams Honda Traverse City

Tuesday June 17th, 5:00pm, my son went into Williams Honda just to look at cars in the lot. He was high pressured into signing. He did not understand the contracts, but was told he would be stupid not to take this great deal they were offering. As soon as he left he called me and told me what he had done. We contacted the dealership early Wed. morn, they gave us a major run around, we talked to most everyone there, but no one would help us undo this. They said the person we need to talk to would be in on Friday. Today Friday, we went back in again and the manager told to get out and stay off their private property. At this point my son has a $25,000 loan and only makes $15,000 a year, also with rent and house hold payments, I can't understand how he even got approved for the loan?? Any ideas, thank you.