Apex domains cannot have CNAME records.
Question and response
Question
dig voxdns.Co.Za. NS
Answer
voxdns.co.za. 1 NS ns2.voxdns.Co.Za.
voxdns.co.za. 1 NS ns1.voxdns.Co.Za.
Authority
The response has no authority records.
Additional
ns1.voxdns.co.za. 1 A 41.193.38.221
ns2.voxdns.co.za. 1 A 41.193.38.222
ns1.voxdns.co.za. 1 AAAA 2c0f:fd58:0:0:0:0:0:10
ns2.voxdns.co.za. 1 AAAA 2c0f:fd58:0:0:0:0:0:11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0