Cell C
Buying bulk is not cheape

CellC advertise R0.15/MB out of bundle data which is quite reasonable.
Bundles are 50, 100, 300, 500. 1000 and 2000 MB. People must note that 2000MB costs R310.
It works out cheaper if you buy multiples of 500MB (R75/MB). This will cost you R300 for 2GB.
In fact, this is true for all the smaller bundles.