"We kept our composure with the bat after taking early wickets", Duminy was quoted as saying by the International Cricket Council (ICC) website.
And while the Proteas had started well in their pursuit, scoring 50/2 in the powerplay, they were constantly facing a required rate of 10 an over.
The series, thanks largely to Klaasen's epic innings, is now squared at 1-1. The southpaw will have to few big innings to cement his spot in the middle-order, where there is lot of competition already in the Indian team.
Duminy dismissed Dhawan (24) when he was looking ominous and Dala produced a beauty to claim the prized scalp of Virat Kohli caught behind (1) - reducing India to 45-3 in the sixth. Kohli had walked off field in the later stages of the match with a hip problem.
Reeza Hendricks was the only one who defied the Indian bowling in the first innings. With his last ball of the match, Chahal once again got the breakthrough when Behardien failed to read a slower one and fell for 39, holing out to long on.
Those two combined for an unbeaten 98-run stand off just 56 deliveries to set South Africa a tough challenge.
Mahendra Singh Dhoni rolled back the years in stunning style as he left the hosts reeling with his power-hitting.
Virat scored 26 runs in 20 balls with two fours and a six. Off just 28 deliveries, Dhoni smashed unbeaten 52, which included four boundaries and six mammoth sixes.
'Black Panther' director Ryan Coogler pens emotional thank-you to fans
Only The Force Awakens has done it better, hitting that number in just five days. The movie is also breaking down barriers with representation and a diverse cast.
Yuzvendra Chahal broke the record for most 6s conceded by an Indian bowler in T20Is.
All-rounder Hardik Pandya didn't get a chance to show how devastating he can be with the bat but he bowled his full quota of four overs. Pandya gave away just 31 runs and also picked up the crucial wicket of David Miller.
For the first time in his career, Bhuvneshwar took five wickets in his Twenty20.
"The way JP told me to go takes the fear out of the game, and then it's very important to keep a calm head".
Cape Town - South African cricket's latest hero, Heinrich Klaasen, says that his dream is fulfilled, even if he hasn't done enough to command a regular place in the Proteas limited overs set-up. However, Bhuvneshwar didn't pick a single wicket and that proved detrimental to the visitors' cause in this clash.
South African opener Reeza Hendricks heaped praise on Bhuvneshwar Kumar, saying the Indian pacer consistently hit the right areas and didn't give the batsmen anything to score off during the first T20 worldwide here.
Thakur too was not too shabby and delivered an economical spell after replacing the injured Jasprit Bumrah.
"AB de Villiers will not be able to take part in the T20 global series against India due to a left knee injury", Proteas team manager Dr Mohammed Moosajee said.