I bought a brand new car, Nissan Magnite from them in May

I bought a brand new car, Nissan Magnite from them in May. In August the dashboard reflected "Check Engine" I reported to them they booked it in on the 11th August. I took the car there and they said it's fixed. The car is still having the same problem. They want me to book in the car again. My query is that I don't want this car anymore if the problem resurfaces in less than 30 days. I cannot always leave work and drive to them at my expenses when the problem is theirs