What exactly is the problem?
Next to the R99 it shows "was R279", so it looks like a special.2GB (R99) cheaper than the 1GB (R155)?
So buy 3 x 2GB (R99) and save R370 on the 5GB package...not bad!
These are data contracts, so can you apply for three of these running concurrently on the same simcard? I doubt it.