Faulty Car

I bought a car in December 2023, and the car has been nothing but trouble (gearbox and engine issues), I took it back to the dealership about 4 times already and they still can't get it right. The car is currently with them and no matter how I plead and ask for them to give me updates or at least a courtesy car nothing happens. I'm frustrated at this moment and I feel they are being unfair in the way they are treating me because I'm required to pay the installments every month. It has been 3 weeks without a car and there's no update whatsoever to show that there's progress, what should I do in this situation?