Bought a car with factory faults that can't be fixed and they are refusing to take it back.

My Aunt bought a Sanders 900T Stepway Plus in December last year and on the day it was bought, the dashboard did not work. Mind you, no speedometer, petrol gauge or any other operational information was showing. They took it for fixing which took and hour. A new car, and they came back and said it was a fuse. It worked for about a week and stopped working again. Since then, it has been breaking two weeks and they come take it for two weeks or more, fix it and bring it back and the issue comes back again. She is really frustrated and when we go there, they keep on bringing a different manager every time. She has met with 8 different managers. EIGHT. And they all say they don't have the power to help her. The car is not road worthy and they just seem to not care about that. It seems like they want to wait for the warranty.