I can't believe this!!!

I can't believe Cell C. I got the phone and 4 days later the phone doesn't want to go on. Cell C sends the phone away and says I must wait. The phone decides to go on again and now they want to give me that phone again. I ask what will happen when it does that again they say I must bring it back. LIKE REALLY!!!!! All I want is a new phone. I had the phone for only 4 days and it does that and now they want me to take that phone again. I was calm about the situation but this is nonsense. What happened to customer services and customer always being right?? Does that not exsist anymore. Then they tell me if I cancel the contract I must pay the full amount of the phone!!! I can't believe this!!! Is this how Cell C operates??