It was Du Plessis' second sanction for dissent in 12 months, after being fined 15 percent of his match fee against India in a one-day international in October.
A third offence over the next seven months would result in a suspension for the 31-year-old.
South Africa failed to teach the World Twenty20 semi-finals.
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed Osmond)
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