Pathetic Service From KIA Tygervalley Multifranchise Service Centre

Pathetic customer service from Kia Tygervalley Multifranchise Service Centre. Engine light on my car came on a few weeks ago.....car still under warranty....and took it in to their service centre for repairs.....was told that it was the oxygen sensor that need replacement....car was with the agent for almost 14 days(apparently waiting for part from Korea)....part finally arrived and was replaced.....still waiting on paperwork for the warranty replacement claim.....4 days ago, the same problem appears again......struggling to get proper communication from them as to what is actually wrong with the car, as it seem that they do not know what to lie to me about anymore....calling them and phone gets put down in my face, called Abdul at KIA SA Customer Care who also just promise to follow up but never get back to me....I have to phone behind them all the time with getting the runaround and excuses everytime....I am fed up with their pathetic service and will NEVER EVER AGAIN buy a KIA