Poor customer service

I took a Sony Xperia E1 on contract with cell c, the phone died and I took it in for repairs to Cell C shop in Cape Gate mall, after about 3 weeks I was told to come and collect my Phone to my surprise it was not repaired. They told me that they couldn't repair it, if I need it repaired I will have to do it myself. What is sad is that this is a contract phone and I'm still paying my monthly installment every month. Why must i continue paying for it if its not working. Someone from Cell C must do something about this as I need a phone if not i'll have no choice but to report this to the Ombudsman.