Imperial select zambesi. Bad customer services

I have bought a car at this dealership and with numerous times took back the bakkie with no success. The bakkies gearbox gearshift couldn't gear down when I wanted to do so. I have the bakkie for 3 months now and only driven this vehicle for only 1 month. The bakkie has being in and out for repairs and still doing the same.

I have requested them to install a factory fitted gearbox but they refused to do so. I am not satisfied with their service.