Mazda dealership Warranty and Customer service

I bought a car from a Sales person by the name of Greg. The gentleman was very efficient in selling me the car. I picked up the car and it had some defects, the sales person told me it's still under warranty and I can take it to any Mazda dealership. I took it to the dealership in centurion and I was told the car is out of warranty and I was charged for inspection and I'm billed for fixing the electrical defects. No one wants to take responsibility. Please help as I am getting no joy.