Apex domains cannot have CNAME records.
Question and response
Question
dig winza.co.za. NS
Answer
winza.co.za. 4 NS ns2.clusterdns.co.za.
winza.co.za. 4 NS ns1.clusterdns.co.za.
winza.co.za. 4 NS ns4.clusterdns.org.
winza.co.za. 4 NS ns3.hostdns.co.za.
Authority
The response has no authority records.
Additional
ns1.clusterdns.co.za. 4 A 41.76.111.83
ns2.clusterdns.co.za. 4 A 154.0.166.77
ns3.hostdns.co.za. 4 A 198.244.190.151
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0