Apex domains cannot have CNAME records.
Question and response
Question
dig adfactory.co.za. NS
Answer
adfactory.co.za. 1 NS ns3.za-dns.com.
adfactory.co.za. 1 NS ns5.za-dns.com.
Authority
The response has no authority records.
Additional
ns3.za-dns.com. 1 A 162.159.24.251
ns5.za-dns.com. 1 A 162.159.25.15
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0