Apex domains cannot have CNAME records.
Question and response
Question
dig confirmanos.cl. NS
Answer
confirmanos.cl. 5 NS dns1.confirmanos.cl.
confirmanos.cl. 5 NS dns2.confirmanos.cl.
Authority
The response has no authority records.
Additional
dns1.confirmanos.cl. 5 A 190.196.208.70
dns2.confirmanos.cl. 5 A 190.196.208.70
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0