I AM BILLED FOR THE CELLPHONE I DO NOT HAVE

I have bought a cellphone on contract at sunnypark pretoria November 2014 with warranty. Early August 2015, it lost network so i returned it to vodacare for repair and i was told that i will have my phone in 7 to 14 working days. I was told it was fixed, but when i collect it it wasn't, This happened three times. On the 28 0f September, i received an sms saying my phone has been ascaled to advance repair. My problem is that it is way too long and i feel like i am entitled to a new working phone or if they cant give me a new phone, they should let me off their contract so that i can go to a supplier that's willing to trade phone than vodacom who is just taking money from me without giving me any service. I spent over 6 hours on the phone yesterday trying to understand why i should be paying for phone i do not have, but no one was willing to give me an answer,so i went to vodaworld and they ave me the same number that i called. but no answer