A fourth suspect, Nashville Julius, received 22 years direct imprisonment for robbery and kidnapping.
A large crowd which filled the gallery cheered when the sentencing was read out, and jeered the accused as they went down to the cells.
Witbooi stared at them and shook his head as they shouted "gangsters" and "viva high court".
Many of the people in the gallery were from the Mitchells Plain Crisis Forum organisation and other organisations which were set up after the violent deaths of women and children in Cape Town.