The convicted murderer appeared in the South Gauteng High Court earlier on Thursday.
He was also sentenced for assault and intimidation.
Judge Ismail Mahomed says Wisani showed no remorse and was callous.
Mahomed says that while he doesn't believe the murder was premeditated, he does think Wisani acted out of rage and knew, while assaulting Mandleleni, that it might lead to her death.
The judge took into account that Wisani is a first time offender and an educated man who has a chance to be rehabilitated.
