Apex domains cannot have CNAME records.
Question and response
Question
dig bitcointernet.co.za. NS
Answer
bitcointernet.co.za. 3 NS ns1.dns-h.com.
bitcointernet.co.za. 3 NS ns1.host-h.net.
bitcointernet.co.za. 3 NS ns2.dns-h.com.
bitcointernet.co.za. 3 NS ns2.host-h.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0