Apex domains cannot have CNAME records.
Question and response
Question
dig provitel.net. NS
Answer
provitel.net. 4 NS ns1.rumahweb.com.
provitel.net. 4 NS ns4.rumahweb.net.
provitel.net. 4 NS ns3.rumahweb.net.
provitel.net. 4 NS ns2.rumahweb.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0