Injury on duty without compensation

The Beauty Room has branches in Kempton park and Ivory Park. They I’ll treat employees and we kept asking for contracts and they promised to make us sign contracts after probation which never happened. We were paid way below minimum wage R2200 per month working 9am to 5/6pm. I got injured on duty while on duty when there was no electricity but was never compensated and I had to borrow money to take myself for treatment and my knee is still in bad shape and I am no longer able to stand long hours . We were all threatened with non payment if we resign without serving notice which is also legal but then I was unfairly dismissed instead of being asked to a least serve a month . The reason being they can’t afford to pay me. They hire mostly foreigners and exploit them. Their business number is 0747582911