Worst service provider

This is the 2nd complaint in the space of 30 days regarding cell c and the putrid customer service. After waiting a month for a handset which they have advertised I was contacted by Mpho from the cell c customer care who had advised me that he would call soon as stock was received at the warehouse and have a handset delivered to me.I still have not received a call from the call centre. I had gone into cell c chatsworth and did the upgrade and received the handset which worked for 4 days and started switching off. I have taken it back into the store still in the out of box warranty period and a new handset was not issued. The staff member informs me that its a 7-10 out of box warranty which will have to go for assessment and I will still be bill as normal. Why have a out of box warranty if you are going to send the handset for assessment which takes so long? This is the worst service that I have received from any service provider ever. The staffs response to this complaint was disgusting as they say that there is nothing that they can do to assist.