Audi's lack of responsibility on a recalled engine

I have an Audi A5 sport 2011. This year alone i have spent over a R 100 000 trying to fix the oil light that continuously comes on and eventually messes with the entire engine. I have replaced sensors, had the computer checked, replaced cam chains and cam cover etc. I have used a certified mechanic and have a log book with the service history. I recently found an Article (please see below) that clearly explains that oil light is a problem which eventually leads to a complete break down/ engine failure. The engines of my year and model were recalled by Audi Germany. I have contacted Audi Germany and they continue to pass me on to Audi SA. The managing Director of Audi SA refuses to assist me in any way, ignoring the fact that the problem is exactly why this engine was recalled. I have given them a proforma invoice From Audi of R 82 000 to fix the engine of which they refuse to take any responsibility. I desperately need to get back to work and unable to without a car as I am a property Broker. I hold Audi fully responsible for my dilemma. I intend to take this further.

http://casestudies.atlanticmotorcar.com/audi-engine-oil-consumption-correction/