Ramaphosa didn't bite.
This is similar to what Trump did to Zelensky and one wonders what exactly his agenda is, apart from being completely ignorant of the facts and wishing to humiliate other world leaders, live in the Oval Office.
Accordin to the BBC these are the facts:
Fact-checking Donald Trump's Oval Office confrontation with Cyril Ramaphosa
President Trump made a series of claims about the killing of white farmers in South Africa, some of which are demonstrably false.
www.bbc.com