Treating customers fairly

I bought a phone at Jetmart Silverton on 30/07/2014. I used the phone for about 3 months after which it just switched off. I took the phone back to Jetmart Silverton and they promised to send the phone to a vodacom repair centre for repairs, i didn't get the phone back till 3 moths later and it was still not fixed. A week later I took the phone back to Jetmart and again i didn't get phone back till 2 months later which was yesterday. the phone is still not fixed. i called Edcon headoffice yesterday and they promised to resolve the issue by today, still nothing. i\m extremely unhappy because the warranty is ending next month which means I paid for a phone that I used only for 3 months. Will i now have to sit with a broken phone forever? What happened to treating the customer fairly? If Jetmart will not give me a new a phone then they must fix this phone and give me back the 9 months of my warranty."