Don't get caught by Mr Willem Pretorius

We ordered windows/frames for our new warehouse valued at over R500k from Mr Willem Pretorius of BEST GLASS in Centurion. After we had paid the deposit, he informed us that he had to pay his accounts and did not have enough money to pay for and collect the windows from his manufacturer. We decided to pay the manufacturer directly the outstanding amount so that we could collect the goods. Mr Pretorius then started installing the windows but did not complete the job and is not interested in completing the job. The end result is that we are out of pocket by over R180k. Apon further investigation, he seems to change his companies and cell phone numbers faster than his underpants.