Apex domains cannot have CNAME records.
Question and response
Question
dig dnservices.co.za. NS
Answer
dnservices.co.za. 5 NS ns1.dns.net.za.
dnservices.co.za. 5 NS ns1.dnservices.co.za.
dnservices.co.za. 5 NS ns2.dns.business.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0