Apex domains cannot have CNAME records.
Question and response
Question
dig vigay.com. NS
Answer
vigay.com. 3 NS ns1-ng.orpheusnet.co.uk.
vigay.com. 3 NS ns0-ng.orpheusnet.co.uk.
vigay.com. 3 NS ns2-ng.orpheusnet.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0