Apex domains cannot have CNAME records.
Question and response
Question
dig todosenvivo.com. NS
Answer
todosenvivo.com. 5 NS ns2.todosenvivo.com.
todosenvivo.com. 5 NS ns3.todosenvivo.com.
Authority
The response has no authority records.
Additional
ns2.todosenvivo.com. 5 A 64.235.60.75
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0