Nissan

I have the car for 1 month. I did not get approved. I asked them to take the car back and I want my 3, 000 Refund I had put down for the Lease. Now they are not calling me back or telling me anything. They said I cannot get my refund back at all. They are saying I lie and my paperwork is not real. WHAT IS THAT ! They needed my PA liences and i gave them copy. They said no CO-signer is needed so i agreed to go ahead. They said I should be fine and needed nothing. Now they bought in my college. WHAT DOES MY COLLEGE have to do with my lease. If it did, why didnt they tell me in the start. I refuse to sign anything and want my money back. They keept threatening me saying they will ruin my credit and not refund a penny. That the car is my. Then they say, return the car. I am lost and confused.