Apex domains cannot have CNAME records.
Question and response
Question
dig VLine.Verat.NET. NS
Answer
VLine.Verat.NET. 5 NS dns1.Verat.NET.
VLine.Verat.NET. 5 NS ns.beotel.NET.
VLine.Verat.NET. 5 NS ns.beotel.rs.
VLine.Verat.NET. 5 NS dns2.Verat.NET.
Authority
The response has no authority records.
Additional
ns.beotel.rs. 2 A 194.106.162.3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0