Apex domains cannot have CNAME records.
Question and response
Question
dig ccbill.com. NS
Answer
ccbill.com. 1 NS ns-1131.awsdns-13.org.
ccbill.com. 1 NS ns-1974.awsdns-54.co.uk.
ccbill.com. 1 NS ns-319.awsdns-39.com.
ccbill.com. 1 NS ns-726.awsdns-26.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0