Salaries not paid

I was contacted by the company owners and was asked to come and help the company with a production that was happening at the joburg and Soweto theatre. We all signed contracts stating the offer that the company is giving you and the when will you be paid. The first month we had problems with late payments and we let it go. For the month of August there were late payments and it was stated that the payments will be late via email. The proposed date was September 07,2017 and nothing was sent ever since then and nothing is being communicated. When contacted - there's no responds on their side. We have worked and provided our service and we haven't been paid.