bad service

I'm so disappointed in the customer service department ,just received the most horrible service ever-I am with cell c for 2 years now and i feel like cancelling my contract. I called the customer service department ,a gentlemen answers and i advise him that i just receive my upgrade phone yesterday and i see cell c customer service has been trying to call me as there is 3 missed calls on my phone his reply was how do you know its cell c calling you ? like seriously i know the number ,i asked him if he can check for me as i also did not received my data that was suppose to be loaded and he advised me to call upgrades department ,i then advise him that he is not being helpful n sounding helpful also and i want to speak to his team leader he then tells me his team leader is busy n puts me on hold forever -3 days i recieved the best service from donsld who did my upgrade and from kimberly who did the insurance ,the agent i spoke to at 11.45am needs to be sent back to training on how to provide customers with good service