Audi South Africa has got bad service

I bought a vehicle from dealers online a 2010 Audi a4 2.0t fsi. When I collect the vehicle I found out that the gearbox is faulty and took it in to Audi Cape Town which told me it will cost R21000.00 to fix after investigation I found out the vehicles gearbox oil was not changed on 60000km which should have been done with Audi Fourways and I contacted Audi South Africa to help me with the matter because the cars freeway plan expired in 05/2015 which is about 2 months ago but I feel if they changed the gearbox oil the problem could have been avoid. Everytime when I phone Audi South Africa they tell me they are waiting on the Regional Manager to give a answer this is now 2 weeks already and refuse to give me the Regional Managers contact number. I deal with all the name brand dealers and this is the worse service I have ever received from a dealer.