Leoka said the incident did not really disrupt the event.
“The hacking did not affect the audio and video. I was not aware of it until someone alerted me,” she told TimesLIVE.
She said none of the participants said anything about the incident.
Asked what Kganyago's response was, Leoka said: “He did not say anything about it. We didn't know about it. It didn't disrupt anything.”
A Telkom official who did not want to be named said technically, it was not a hack because the person who wrote the comments had joined legitimately.
“The webinar was widely advertised. It was someone who just decided to be unruly.”
He said the chat section of the webinar was shut down after the incident.
SA Reserve Bank spokesperson Leisel Radebe referred requests for comment to the organisers.
* This story was amended since it was first published to remove the details of the defamatory accusations.