Nissan of Staten Island

Nissan Staten island, did paperwork for a car not noticing it's damage on bumper. Sales person didn't say anything until I said to him it's damage. Then he looks at me and tell me it's a used car. I asked him who pays so much money for a damage car. He tells me they doing construction around here and it got damage. They don't want to cancel contract because I left lot with car, not knowing if I left with it I can't cancel contract. If I had left the car and taught about it and went back in two days for the most, they would have to cancel it. I asked when I took the car back why I wasn't told about this, I was told this is not a conversation they have with customers. They willing to fix it, but who want a car knowing it was hit and they weren't honest about it.