After the recording went viral, a social media post claiming the pupil was suspended for five years caused the video to trend, but Sunday World has established she was suspended for only five days.
Following investigations conducted by the school, the pupil was asked to appear for a disciplinary process.
The pupil, who cannot be named to protect her identity, was found guilty of transgressing the school's code of conduct, public indecency and using foul language and was asked to spend a week at home.
The girl's devastated mother declined to comment.
Gauteng education department spokesperson Steve Mabona said it was not the first undesirable incident that had happened at the school.
"[The] utilisation of a cellphone in the classroom especially during contact time is prohibited and, as such, learners should be mindful of what they record on their phones."