Chasing India's 303 for six, South Africa once again surrendered before Chahal (4/46) and Yadav (4/23) to end way behind at 170 all out in 40 overs.
The hosts lost the third ODI by 124 runs to surrender an unassailable 3-0 lead in the six-match series.
"What they've done really well is assess the conditions in terms of what they need to do, what sort of speed and length they need to bowl. They (Chahal and Yadav) haven't made it easy for us to get singles," Duminy said.
Duminy said with three matches remaining the series is not yet over and the hosts would need to do some series thinking before the fourth ODI.
"I think there should be a plan. There's no doubt that we will reconvene after this game and break down where we are going wrong. It's pretty obvious that we haven't played their spinners well enough," he said.
Chahal and Yadav have been at their imperious best, snaring 21 wickets between them in three matches so far.
Duminy and Aiden Markram put on 78 runs for the second wicket, but after the latter's stumping South Africa's chase fell apart.
"At that point we were building quite a nice partnership so it was just about rotating the strike. We know at a venue like this if you have wickets in hand you give yourselves a chance chasing eight or nine an over," Duminy said.
The left-hander said South Africa batsmen are finding it difficult to pick Chahal and Yadav.
"We've just got to find a way to counter them (Chahal and Yadav). The key is definitely to try and be positive, but unfortunately on a few occasions we haven't picked the wrong 'uns," he said.
"When you are not picking their wrong 'uns, you are not necessarily comfortable. Once you become comfortable with picking their deliveries, thats when you can play with confidence."
And Duminy said Kohli belongs to the elite league and South African bowlers need to think differently to get the better of the India captain.
"He's (Kohli) up there with the world's best. You have to take the opportunities when it comes, especially in the first 20 balls. We've created chances but unfortunately we haven't got grab those," he said.
"He's in really good form at the moment. He has had an unbelievable year and he has just carried on. He is oozing with confidence. We're going to have to come up with different plans for getting through him," Duminy added.
"Look at Virat's innings today, the way he paced it. He didn't strike at 100 today but then picked it up at the end.
"We've spoken a lot about how crucial partnerships are, but unfortunately we haven't had the opportunity to put together partnerships," he said.
South Africa now face a huge task of turning the series around. The hosts now must win all three remaining games to draw the series level.
South Africa would be bolstered by the return of AB de Villiers, who missed the first three ODIs due to a finger injury.
"He is one of the world's best players in one-day cricket. He will bring confidence to the team and his leadership within the group will add a lot of value as well.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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