Apex domains cannot have CNAME records.
Question and response
Question
dig dna.co.za. NS
Answer
dna.co.za. 2 NS ns3.wixdns.net.
dna.co.za. 2 NS ns2.wixdns.net.
Authority
The response has no authority records.
Additional
ns2.wixdns.net. 1 A 216.239.36.100
ns3.wixdns.net. 1 A 216.239.38.100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0