Terrible service

I took my cellphone in for repairs since it was not switching on. The phone is still under warranty since it was bought under 1 year ago. They never called me to say the phone was back at the cell c store until I called them. When I called them they told me it was received 2 weeks ago and that the system says they called me however no called was received. In 2 weeks nobody called to tell me the phone was ready. The person I spoke to had attitude and was very rude on the phone. Then when I went through to pick up the phone they tell me that the phone is not repairable.they could not give a reason why not were they will to replace the phone. I have had numerous problems with cell c in the past as well. They are refusing to replace the phone even though it seems to be a factory fault as it just doesn't switch on. The cell c store at carnival city is extremely unhelpful and rude.