I just noticed that the 5 gig data bundle is applicable for only some phones and the note 3 is not listed. Can someone who has the Smart 100 plan with the Note 3 please confirm if they have been able to use 5 gigs within contract data bundle?

They do, it is in their booklet as well. The information on their website is sometimes very inaccurate. They still list the Galaxy Note 2 and S3 Mini but as far as I know they don't sell them any more.
Multiple people on the Note 3 thread have also confirmed that they receive the 5GB every month.
Their booklet: http://www.telkommobile.co.za/media/downloads/TelkomBrochureNew_Small_NewLinks.pdf
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Didn't read the fine print. How does the unlimited data exactly work ? Is there a fair usage.