Call Centre SITE management

This company (iSON Experiences), Multichoice keeps award campaigns to for their Call Centre services treats us employees like ****. For 1 some have access leave of more than 10 days and they always reject leave applications saying there are no slots while we app**** 2 weeks in advance and have more 10 days due to us. The managers there get more than a week leave and even during their so called freeze period. They don't pay us for our days at the end of the cycle since they always reject leave applications - how can you reject a leave for someone who works 6 days a week even night shift, the way they treat us its like we are earning while they just pay us just the R21.689 minimum wage. its not just leave even things management don't even do their jobs for instance when customer request call backs or to talk to a manager - they give you million excuses.