Poor Customer Service

bought a VW Polo TDI 2016 on 10 August 2017 at VW Hatfield Rivonia. The car has had issues with the pre heat diesel and engine fault light going on. I've taken the car to the service department at the dealership three times for the same issue.

The first time the car was checked for faults and it returned no faults. The lights went off and came on after a week from the dealership. The second time I took the car in for the same issue and a software upgrade was done on the vehicle. The third time I took the car in with the same fault and they picked up that the car returned faults which they have been in communication with VW Germany to resolve it. The car has been at the dealership since 22 November 2017 and I have not had alternate transportation to continue with my daily activities. To date I have even lost business opportunities as a result of not having a car. I have been requesting for a loan car but have been told that all loan cars were with customers and they will try arrange something but nothing has happened. As I'm writing this I have no idea as to when the car will be ready let alone whether I will receive a loan car moving forward.