Brand new skorokoro

I bought a so called brand new car with them and since then i have never had peace of mind, i am struggling more than a person who bought a use car, the car in question has since had a whistling sound on all the windows. I returned the car more than 4 times and all they do is take it in and return it in the same condition. The situation even got to a point where my job was at risk hence i stoped fighting to avoid always asking to be excused from duty to go solve this matter