Work left incomplete Once Paid

I hired Leon and Sarel from S.L Construction Boksburg to do some painting and refurbish my carport. I was asked to pay a 50% deposit before work commenced which i did and on the day they started the work they asked for another 25%. Then a few days later they asked for the balance of the money as they confirmed they were going to complete the work in 2 days time. I paid this money and only held back R2010 which was for additional work they had done. After that they did not come back to complete my carport and every time i contacted Leon, it was excuses and he would say tomorrow, and now its 2 months and still no sign of them. It is now going to cost me way more than the money i held back for me to complete the carport. Please be aware and dont make the same mistake i did as when they initially come they seem very trustworthy and helpful but they are very ********* and have no work ethic.