Apex domains cannot have CNAME records.
Question and response
Question
dig gphosting.co.za. NS
Answer
gphosting.co.za. 5 NS ns-1766.awsdns-28.co.uk.
gphosting.co.za. 5 NS ns-1292.awsdns-33.org.
gphosting.co.za. 5 NS ns-275.awsdns-34.com.
gphosting.co.za. 5 NS ns-754.awsdns-30.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0