workers underpaid

I was working for this company I was promise a salary of R100 a day , overtime as well as bonus. I also worked over weekends. Even tough there was no contract singed it was a verbally agreement. This company was also charging customers for new parts on caravans but were putting in 2nd hand parts. Just to name one of the clients was W Becker. When it was time pay me and the workers we all got underpaid and not what we were promised from the owner which is VF Potgieter. Dead lines was never met.I feel this was unfair treat ment and not going to stop here