Horrible / ********** service

I bought a Polo GTI 2014 model car in December 2015 . It had faulty indicating lights returned it for service repair after that the engine had problems in April 2016, I retuned the car back as it is under warranty. In May 2016 they said it has been fixed. In October 2016 the Same problem occurred the engine did the same. I retuned the car to the dealer. I had to wait three weeks to get a courtesy car. It was with the dealer for 9 months. After numerous calls to the dealer they called to say I must collect it on the 7 July 2017 I collected the it. On the 9 July 2017 I retuned the car to the dealer as it still had same problem. It was with them until the 19 August they called to say I must collect it. On the 21 August I retuned it again as the problem was not fixed. I have been to the dealer and phoned the VW Head office (Mr Hendried Vermak's office) I have been communicating with his Personal Assistant ( Lzet) even wrote an email yesterday to Mr Vermak and resent it to his PA today. I'm still paying my full installment for a car I don't have. They refuse to replace the car, they moving me from pillar to post with no solutions. I'm really disappointed with VW service, I can't be driving a courtesy car for such a long time. Angry and frustrated customer.