Unfair labour practice

Imvula Quality Protection with unfair labour practice. The company mentioned above is abusing workers in the name of if you loose this it won't be easy to get another job. People are working more than 30 days no off and they are even not allowed to take leave. When they speak their mind their told to they will loose their job. And all this is happening on one of their site at Germiston at Albany. Is a security job but they are doing something way above their pay grade of security,while the guards get no extra cash or bonus but supervisor and manager are getting bonuses every months