Spar Rietfontain mistreating employees

I have complaints against Spar Rietfontain Pretoria who are abusing and taking advantage of young South African girls, firstly they make them work without any contracts , long hours without any overtime and unfair undocumented dismissals without any pay. These acts have being going on for years and cycle keeps happening over and over again. How can Spar say they care about the consumer when when they unfairly treat their employees who must give us costumer good service. The last batch of girls who were unfairly dismissed are still unpaid for the days they worked and when they enquire no one can give an answer .