Apex domains cannot have CNAME records.
Question and response
Question
dig wghservers.com. NS
Answer
wghservers.com. 5 NS abuja.ns.whogohost.com.
wghservers.com. 5 NS lagos.ns.whogohost.com.
Authority
The response has no authority records.
Additional
abuja.ns.whogohost.com. 5 A 102.210.146.80
lagos.ns.whogohost.com. 5 A 102.210.146.80
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0