Apex domains cannot have CNAME records.
Question and response
Question
dig myaisfibre.com. NS
Answer
myaisfibre.com. 4 NS ns1.myaisfibre.com.
myaisfibre.com. 4 NS ns2.myaisfibre.com.
Authority
The response has no authority records.
Additional
ns1.myaisfibre.com. 4 A 58.64.49.151
ns2.myaisfibre.com. 4 A 58.64.57.151
ns1.myaisfibre.com. 4 AAAA 2405:9800:b011:144:0:0:0:151
ns2.myaisfibre.com. 4 AAAA 2405:9800:b019:144:0:0:0:151
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0