Um no, you have your networks confused. I live in Constantia, have been here for a long time. CellC have better coverage here and MTN and Vodakak are the ones that have poor coverage.
CellC are getting a lot of heat lately, people forget they are the main driver of why prices have dropped as far as they have. Vodacom are clearly bullying them. People complain to CellC is not providing them the good service levels which is fine but then the berate CellC for complaining that Vodacom are not giving them good service levels - bit unfair.
At the end of the day, as far as I am concerned, each network is *** and you get dropped calls, bad connectivity etc etc. I have been on Vodacom, MTN and CellC and they all have problems. At the end of the day, CellC take considerably less money from my account every month, and for that I am grateful to them.
Support the underdog, help the competition...or stop complaining that monopolies are ripping you off.
Edit: Not directed at you although I quoted your post, just talking in general as to what I have read on these forums...