Apex domains cannot have CNAME records.
Question and response
Question
dig compu-safe.co.za. NS
Answer
compu-safe.co.za. 1 NS ns4.cstsupport.co.za.
compu-safe.co.za. 1 NS ns3.cstsupport.co.za.
compu-safe.co.za. 1 NS ns1.cstsupport.co.za.
compu-safe.co.za. 1 NS ns2.cstsupport.co.za.
Authority
The response has no authority records.
Additional
ns1.cstsupport.co.za. 1 A 169.239.219.120
ns2.cstsupport.co.za. 1 A 169.239.216.120
ns3.cstsupport.co.za. 1 A 149.56.97.89
ns4.cstsupport.co.za. 1 A 164.132.100.141
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0