Sale of unroad worthy vehicle, lies, unresponsive

Purchased a second hand vehicle in February 2015...from the second hand section of Audi Braamfontein. In November 2015, VW Grahamstown declares the vehicle undrivable with numerous issues. Despite continuous reaching out for help 4 emails and numerous calls to various persons that I dealt with during the sale... Nothing is forthcoming from Audi apart from \they are checking