Apex domains cannot have CNAME records.
Question and response
Question
dig ecosdelsur.net.do. NS
Answer
ecosdelsur.net.do. 5 NS ns7109.banahosting.com.
ecosdelsur.net.do. 5 NS ns7108.banahosting.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0