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