No call back

I have been communicating with Renault SA for weeks now and spoke a call centre agent two weeks ago and she promised to call me back but I am still waiting. There is a bill of R23.000.00 that I am complaining about and No one seems to care. It is clear that I need to take this to Motor Ombudsman for review. We are not taken serious in SA but these manufactures that we support so well. I have owned three Renaults in my time and all this time have been promoting and spotting for them only to be treated like a Nobody by Somebody. I repeat, see me a Renault vehicle again after this debacle, shoot me!