With this win, Punjab, who have already qualified for the semifinals, have finished on top of Group B with 16 points and will enter the knockout stage unbeaten.
The hosts were in complete control of the inconsequential rubber as they won the toss, shot out the South African side for a mere 135 in 18.3 overs and then overhauled the target without any fuss with 11 balls to spare overs at PCA stadium.
Richard Levi top-scored for the South African side with his 42-run knock but it was Hashim Amla who provided impetuous to their innings at start with his blistering 22-ball 40.
Amla and Levi were only ones who put up some resistance as other Cobras batsmen failed to get going and were bowled out without completing their 20-overs quota.
Cobras were 105 for two in the 13th over and lost last eight wickets for addition of just 30 runs.
Virender Sehwag (23) looked in good touch as he played some delectable drives on the off side before being dismissed by Robin Peterson.
The other Punjab opener Manan Vohra (23) became second victim of Peterson as the left-arm spinner gave away just 19 runs in his four overs.
Big-hitting batsman Glenn Maxwell (23) hit a six each off Omphile Ramela and Sybrand Engelbrecht but he also could not last long. Wriddhiman Saha kept holding the one end as he guided the side home with his 35-ball 42.
Saha was excellent behinds the wickets also as he effected two stumpings and took one catch.