Apex domains cannot have CNAME records.
Question and response
Question
dig VoX.co.za. NS
Answer
VoX.co.za. 1 NS ns2.voxdns.co.za.
VoX.co.za. 1 NS ns1.voxdns.co.za.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0