Batir Construction does not pay their contractors

I have been a contractor to Batir Construction CC (South Africa) on a few projects installing gate automation and for over 6 months they have been avoiding me when I request payment. I have spoken to other contractors who have worked for Batir Construction CC and they have also stated that they will not work for Batir Construction CC again after the latest House Bartan project due to poor payment from Batir Construction CC.