Apex domains cannot have CNAME records.
Question and response
Question
dig cecomsa.net.do. NS
Answer
cecomsa.net.do. 5 NS ns2.dreamhost.com.
cecomsa.net.do. 5 NS ns1.dreamhost.com.
cecomsa.net.do. 5 NS ns3.dreamhost.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0