Unfaithful car dealers

I bought an NP200 at autopedigree in November, I have not received a number plate from them. The permit that I was using now has expired on 21 February ans I'm unable to drive my bakkie as it doesn't have a number plate. I spoke to John at Kroonstad autopedigree he promised that before the permit expires I would have received my number plate but he is not answering his phone he is not communicating with me, I'm really upset because I can't drive this car and I kdont know who to contact for further and reliable assistance