Before I leased my Cadillac I asked specifically a...

Before I leased my Cadillac I asked specifically about having to replace the tires on the car. I was told by sales I would not need to replace them during the duration of the lease. Tires only lasted 20k miles and Cadillac knows these tires are faulty. I was asked to pay 50% of the replacement, which is $500. The General Manager was called over to speak to me. He called me a liar in front of everyone in a packed waiting area and told me to take the deal. Otherwise I will be charged $1000 when I turn in the car. Why would something that is faulty cost the customer money to replace? The GM was very smug and arrogant. Not very classy Cadillac.