Apex domains cannot have CNAME records.
Question and response
Question
dig my-server2.co.za. NS
Answer
my-server2.co.za. 3 NS ns2.hostserv.co.za.
my-server2.co.za. 3 NS ns1.hostserv.co.za.
Authority
The response has no authority records.
Additional
ns1.hostserv.co.za. 5 A 41.185.8.25
ns2.hostserv.co.za. 5 A 41.185.8.26
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0