Hyundai sold me a faulty car and won't assist me when it gives me problems.

I purchased a car at Hyundai Wonderboom last year in October, and six months into driving the car, it started having battery problems. I notified them, and I was told that the car was no longer in warranty, even though it was a 2024 model. I had to pay for a new battery from my pocket because the car kept stopping on the road. In September, the car started emitting black fumes from the exhaust, and still, I am not getting assistance. All these issues are happening to a brand new car that turned 1 year old in October (This month).