Faulty Renault Koleos

I purchased a 2009 Renault Koleos 2.0 DCI 4X4 from Renault Centurion. When the vehicle was purchased I informed Renault Centurion's representatives that a trustworthy vehicle is essential, as it is one of the terms of my employment. I was assured about the quality of the Koleos, and took delivery of the vehicle on 11/02/2015.<br> I immediately upon receipt of the vehicle, noted certain defects. I took this up by email with various people employed or associated with Renault Centurion.<br> The vehicle was fetched for repairs less than two week after delivery. The vehicle was finally delivered back to me on 10/04/2015, more than six weeks after it was fetched for \replacement of a sensor".<br> The following day"