Audi West Rand pathetic service

I bought my car in 2014. I religiously took it in for service. From around 60000km i was complaining of a knocking sound, a report always came back saying there is no fault. At 98000km i took it in for a final inspection before my warranty lapsed, the technician advised that engine mountings had to be changed. the warranty claim was declined, instead i was served served with 10k quotation. i let it pass, i then ordered one mounting and got it changed somewhere and i laid an official complaint. The resolution was that they will change the other mounting on retrospect warranty and refund the cost of the other mounting and labour. its been a nightmare to secure that refund since mid April. The Dealer principal is never around to assist, the Accountant is even worse to get hold of. The Services Manager promises to call back to no avail. Is there an Audi SA contact available to lay an official complaint for this branch?