Apex domains cannot have CNAME records.
Question and response
Question
dig kaboom.com.co. NS
Answer
kaboom.com.co. 4 NS dns1.emcali.net.co.
kaboom.com.co. 4 NS dns2.emcali.net.co.
kaboom.com.co. 4 NS dns3.emcali.net.co.
Authority
The response has no authority records.
Additional
dns1.emcali.net.co. 4 A 200.29.96.22
dns2.EMCALI.NET.CO. 4 A 200.29.96.27
dns3.EMCALI.NET.CO. 4 A 200.29.104.22
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0