Bad Service and customer rights violation

I purchased the phone (Samsung J1) on the 29/05/2015 and brought it back after 2 weeks (12/06/2015). I was told they going to repair it. I then collected it on Wednesday 08/07/2015 claiming that the phone is working, but it was not. I returned it again on the 13/07/2015. They told me to come and get my phone last week but only to find out that they did not do anything to that phone telling me that they have tested the phone and it passed. I am still stuck with an broken phone now but I gave them my money. Sometimes they take the phone longer than we agreed on (which entitles me for a refund or replacement) but Rebecca will do her best to manipulate me.<br> <br> Otherwise they refer me to Vodacom, why because I didn't buy my phone from Vodacom? What must I do with this broken phone because you don't want to refund me, replace the phone even if I am complaining that the phone is not working.