Apex domains cannot have CNAME records.
Question and response
Question
dig esmonsa.com.ec. NS
Answer
esmonsa.com.ec. 5 NS ns1.ecuahosting.org.
esmonsa.com.ec. 5 NS ns2.ecuahosting.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0