Not good with after sales service on used vehicles

Not good with after sales service on used cars. I bought a used 2020 car from CMH Nissan Hillcrest that was licensed to me in January 2026. After a week or so I heard a noise in the brakes and took it back to the salesman. He said, ‘That’s how these cars are.’ No offer to have the workshop look at it. - Then about 3 weeks after getting the car the battery went dead. I had it tested at a battery shop and the print out said it needed replaced. I sent a picture of the print out to my salesman and he said battery companies were just trying to make money. Again, no offer of having the workshop look at it.