ns3.cotecal.com.ar has no CNAME records.
Question and response
Question
dig ns3.cotecal.com.ar. NS
Answer
The response has no answer records.
Authority
cotecal.com.ar. 383 SOA ns1.cotecal.com.ar. postmaster.cotecal.com.ar. 2021110213 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0