Apex domains cannot have CNAME records.
Question and response
Question
dig mpay24.com. NS
Answer
mpay24.com. 3 NS ns-918.awsdns-50.net.
mpay24.com. 3 NS ns-60.awsdns-07.com.
mpay24.com. 3 NS ns-1565.awsdns-03.co.uk.
mpay24.com. 3 NS ns-1142.awsdns-14.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0