Audi TTS Dynamic mode doesn't work and Audi expects me to wait for a "possible solution" for three months !

Bought my Audi TTS on the 6/01/2017, in October 2017 I reported a problem with the Sports Dynamic mode to Audi Bruma - their reply : could not find a fault. January 18th 2018 I took Audi Bruma's senior mechanic with me to show and identify the problem. I have since reported the matter to Audi SA who have reverted with a reply: "Audi Germany will let me know what or if there is a solution on the 29th March 2018.... I love Audi but this is where my DIVORCE with Audi begins. Are they so high and mighty that they can make me wait for months to receive a response with a "Possible Solution" ? Is this reasonable ?