Quinton de Kock's appeal against the charge laid against him by the ICC has failed with the Proteas wicketkeeper fined 25% of his match fee.
He was also handed one demerit point.
The 25-year-old faced a level 1 charge, which also related to "conduct that brings the game into disrepute" with a fine being the most severe punishment.
It was reported on Monday on the final day of the first Test that personal insults were at the root of a row between De Kock and Warner.
Footage has emerged of Australian opener David Warner sledging Quinton de Kock before the pair had their tunnel bust-up at Kingsmead on Sunday.
A now infamous video that showed Warner confronting De Kock in the Kingsmead tunnel at the end of the second session has seen both players charged by the ICC.
Since then, there have been numerous suggestions of exactly what happened with Warner accused of having insulted De Kock's family while De Kock reportedly made derogatory remarks about Warner's wife.
The Aussies have backed their man, stating that at no point did Warner cross the line.
But Fox News in Australia published a new video on Wednesday that shows the moments leading up to the altercation in the tunnel.
In the video, Warner can be seen and heard calling De Kock a "f***ing sook".
'Sook' is a common term in Australia that is used to describe somebody who complains a lot.
De Kock reportedly hit back with a comment about Warner's wife shortly after this as the players were walking up the tunnel, and that is what set Warner off.
Meanwhile, Australia's Warner escaped a ban and has instead been fined 75 percent (R160 000) of his match fee.
In addition to the fine, three demerit points have been added to Warner's disciplinary record.
Warner admitted the offence and accepted the sanction proposed by Jeff Crowe of the Elite Panel of ICC Match Referees and, as such, there was no need for a formal hearing.
The second Test between South Africa and Australia will get under way on Friday at St. George's Park (10:00).
WATCH: Warner swears at De kock before Kingsmead bust-up