No Assistance even after calls and emails PRE -REG

We bought our car at Audi PMB in 2013 as a pre-owned vehicle. It is an Audi Q5 3.0TDI 2011 model. On the 13 January 2015 we took the car for a 90000km service and Audi Arcadia told us that the motor plan had already expired in 30/11/2015 already. They did a minor service (AS A FAVOUR) but told us that they could not do repairs on the car since the motor plan was out. We then went back to the sales dealership Mr. Riaz Mohamed (PMB) who acknowledged the problem and promised to make amends. We have since called and sent emails with only promises to fix the car but to this date (a month later) the car has not been fixed. I have even spend money to go and visit Mr. Mohamed at the dealership and he still promised that they will fix the car, they have the quotations that he requested a month ago already, however the car is still not fixed, instead he no longer returns calls or responds to any email sent to him.<br> <br> this issue is a cause of stress and the poorest service ever since we started using the Audi brand (over 10 years ago) and experienced their service over the years. This is a first time that we have been ignore and relegated to nothing. PLEASE ASSIST US ASAP!!!!