Faulty car

I took my Nissan magnite that had an engine light problem after 8 months in possession. This is a brand new car, it’s been about 3 months since it’s been with the dealership, I layed a complaint with customer service and nothing has been resolved. I expressed my concerns and asked for another car or they it back because clearly this car is faulty and not safe for me to continue driving it,even their technician can’t resolve the problem. They gave me a rental car instead which is inconveniencing me because it takes a lot of petrol compared to the car I bought and besides it’s not what I’m paying for every month. I want to change my insurance I can’t do that either. Someone please help because these people are not taking me seriously because I’m just single black woman who doesn’t have any one to help me. I don’t want their car anymore, I want them to pay off their car with the bank.