Building contractor on the run!!

I had an agreement with this company to build a house in Riviersonderend and paid the requested deposit. They duly started digging trenches and then requested further payment as they did the slab. I paid them and thereafter I started having problems for them to continue building. they had a million excuses and never showed up at the site. My calls went unanswered and they did not respond to any of my WhatsApp's or emails. They disappeared with close to R500,000 and are nowhere to be found!! Please be very aware of this company as I am aware of other customers who were also ******* out of their money.