Apex domains cannot have CNAME records.
Question and response
Question
dig bancoguayaquil.com. NS
Answer
bancoguayaquil.com. 3 NS dns1gye.cyberweb.net.ec.
bancoguayaquil.com. 3 NS SRV2.TELCONET.NET.
bancoguayaquil.com. 3 NS SRV1.TELCONET.NET.
bancoguayaquil.com. 3 NS dns1uio.cyberweb.net.ec.
Authority
The response has no authority records.
Additional
srv1.telconet.net. 3 A 200.93.192.148
srv2.telconet.net. 3 A 200.93.192.161
dns1gye.cyberweb.net.ec. 3 A 200.24.194.82
dns1uio.cyberweb.net.ec. 3 A 200.24.208.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0