I recently purchased a van from a local dealer. I was approved, signed all the papers ( including the title) and have had the van for 2 weeks. Now they say the bank is backing out of the loan and they want me to sign a new agreement with a higher interest rate and a higher monthly payment. Is that legal? Since I already have my plates on it and have been driving the van for two weeks? Also, they already sold my trade in vehicle, so I can't even go back into that!