Defective Car and no help from anyone

we bought a Magnite last week, beautiful car , then came the nightmare. The gearbox is making a noise when the car is cold and when we opened the bonnet low and behold it is a renault gearbox. Now i know from personal experience once this happens you have endless issues and repairing and repairing just doesnt work as i had this with a Triber. I bought it from your Mossel Bay branch staying in Johannesburg we made contact with your Greenstone branch told them we have a video of the noise (no one seems interested in seeing the video) we told them we know this is a issue. Mark the manager told us yes Nissan is aware of this problem (WHY then are you still selling a problematic batch of a car) i must bring the car in it will need to be send to head office for assessment. Now i asked will i get a loan car as this is my transport to drop my child at school and to get to work. I got told sorry in his experience dealing with all the cars going in for repairs they have never given a loan car. So i am basically being told yes you bought a defective car, we will look at it under warranty even though you know it is defective and sorry how you get around is not Nissan problem at all. and here i thought it was only Renault that gave this type of service but it seems to be a norm in selling cars these days....