Apex domains cannot have CNAME records.
Question and response
Question
dig promo-tcl.co.in. NS
Answer
promo-tcl.co.in. 5 NS ns-135.awsdns-16.com.
promo-tcl.co.in. 5 NS ns-722.awsdns-26.net.
promo-tcl.co.in. 5 NS ns-1095.awsdns-08.org.
promo-tcl.co.in. 5 NS ns-1907.awsdns-46.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0