Apex domains cannot have CNAME records.
Question and response
Question
dig esefa.ac.za. NS
Answer
esefa.ac.za. 4 NS dns1.uct.ac.za.
esefa.ac.za. 4 NS dns2.uct.ac.za.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0