Apex domains cannot have CNAME records.
Question and response
Question
dig 1-grid-mx03.co.za. NS
Answer
1-grid-mx03.co.za. 1 NS ajay.ns.cloudflare.com.
1-grid-mx03.co.za. 1 NS etta.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0