Sold a faulty “Brand new” car that brought nothing but pain and frustration

I purchased a Nissan Magnite in February 2024, On the same day as I was driving home with a brand new car, the warning light came up on the dashboard saying to check air pollution, I called the salesman who told me to bring the car to the workshop, I was informed that the issue was sorted. 2 days later the same warning light came back, I was told to bring it again. I was informed that the sensor was replaced, and to my surprise, the warning light came back again, I was told to bring it again and it was in the workshop for 7 days. When I sent an email to Nissan South Africa, the dealer called to tell me to come and fetch the car, I was told no fault was found after the car was kept for 7 days. Now I will be stuck with a broken "brand-new car that I am paying for. The "brand-new "car is one month old but it already spent most of time at the workshop, no one cares about my issues and how I feel