I have been in contact with a colleague that has tested positive for covid 19, i have self isolated for 8 days and would like to do a covid test on monday before returning to work on wednesday 27 jan?

Covid Testing: The exact testing process may be different in different provinces and between the public and private sectors. In general, you need to first contact your healthcare provider or your local clinic/hospital. They will tell you what the exact process is for you to be tested. ref: https://www.nicd.ac.za/diseases-a-z-index/covid-19/advice-for-the-public/what-to-do-if-i-think-i-have-covid-19/