Apex domains cannot have CNAME records.
Question and response
Question
dig Co.Za. NS
Answer
co.za. 2 NS ns5.dns.net.za.
co.za. 2 NS ns2.dns.net.za.
co.za. 2 NS ns.coza.net.za.
co.za. 2 NS coza1.dnsnode.net.
co.za. 2 NS ns2us.dns.business.
Authority
The response has no authority records.
Additional
ns.coza.net.za. 2 A 206.223.136.200
ns2.dns.net.za. 2 A 196.29.59.175
ns5.dns.net.za. 2 A 196.29.59.176
ns.coza.net.za. 2 AAAA 2001:43f8:30:0:0:0:0:200
ns2.dns.net.za. 2 AAAA 2001:43f8:790:5901:0:0:c41d:3baf
ns5.dns.net.za. 2 AAAA 2001:43f8:790:5901:0:0:c41d:3bb0
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0