Work without Payment

I worked as a security guard at above mentoined company for more than 8 months, interrupted periods. I can only recall being paid in full 3 maybe 4 times. All the other salaries were given in drips and drabs. To date I haven't received my last months salary from them. Where I worked in a 31 day calendar month more than 8-9 double shifts. When I asked the owner Hendrick Vosloo about my salary of more than R7900 he pulled a knife on me. Where is the securing In that? Please tell me!