The hosts clinched the series after winning the second one-dayer here by 134 runs.
"Winning seven out of our last ten ODIs means we are definitely on the right track. There have been problems for us when it comes to consistency. We have been going through some tough times over the last two years in ODI cricket and sort of building a team.
"We have been sticking with the same players for a while now and we are enjoying our cricket. The results are starting to come through but we are nowhere where we want to be. But obviously, winning the series against the no.1 side in the world is very satisfying. It is something we can really be proud of," he said.
Quinton de Kock and Hashim Amla put on 194 runs for the first wicket and in doing so, brought up their individual hundreds. The middle order didn't fire though, unlike at Wanderers, with the captain coming up at number three himself and falling cheaply. It left the task to Ryan McLaren and Vernon Philander to give them a push in the latter overs.
"I am hopefully still a wicketkeeper in the Tests," said the Proteas' ODI captain, when asked about the form of young Quinton de Kock in particular.
"Quinny is obviously showing he has got the skill and the talent to keep in all three formats of the game. Maybe he still has got to get a bit of experience to gain when it comes to Tests. It is up to the selectors to decide, and the coach and the captain to make that call.