VW Claremont- empty promises

Horribly upset with the service from vw Claremont. It’s over 6 weeks and I am still driving with a car with a engine light on, the day I collected the vehicle the engine light went on as I was driving away. After a lot of issues it became clear that the “master car” that I bought had a custom exhaust so the maintenance plan they sold me is useless as the car does not have original parts. They agreed to replace the parts however 7 weeks later and still nothing!!!! no spare key and still no refund on my license and registration that I had to pay after they had charged me for that. Part of the agreement was that they will refund me the transport fees for the vehicle and after 4 weeks of fighting and sending mails every 2 nd day they refunded me a ridiculous amount of R1500. In which world will that be the total amount to transport a scirocco from Cape Town to jhb on a truc****???? The price he quoted me was R3500 so what happened to the balance of R2000???? I have spoken to the managers and sales man so many times and every time they promise it will be sorted by end of the week... 7 weeks later and I’m still very very unhappy. They are not keeping their side of the sales agreement and I’m starting to consider cancelling the sale!!! How can you sell a R350 000 car to someone and expect them to drive with an engine light on????? What if the engine brake down ? My maintance plan will not even cover it. Absolutely horrible service!!!!! I always hear I’ll phone you back I’m with a client.... so what am I????