Apex domains cannot have CNAME records.
Question and response
Question
dig dotnetworkdns.co.za. NS
Answer
dotnetworkdns.co.za. 1 NS ns1.dotnetworkdns.co.za.
dotnetworkdns.co.za. 1 NS ns3.dotnetworkdns.co.za.
dotnetworkdns.co.za. 1 NS ns2.dotnetworkdns.co.za.
Authority
The response has no authority records.
Additional
ns1.dotnetworkdns.co.za. 1 A 41.77.58.154
ns2.dotnetworkdns.co.za. 1 A 41.77.58.157
ns3.dotnetworkdns.co.za. 1 A 41.223.172.166
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0