Apex domains cannot have CNAME records.
Question and response
Question
dig vtecrm.com. NS
Answer
vtecrm.com. 2 NS dns4.arubadns.cz.
vtecrm.com. 2 NS dns.technorail.com.
vtecrm.com. 2 NS dns2.technorail.com.
vtecrm.com. 2 NS dns3.arubadns.net.
Authority
The response has no authority records.
Additional
dns3.arubadns.net. 1 A 95.110.220.5
dns4.arubadns.cz. 1 A 81.2.216.238
dns3.arubadns.net. 1 AAAA 2a00:6d41:3:206e:0:0:f:1
dns4.arubadns.cz. 1 AAAA 2001:15e8:104:4:0:0:0:d8ee
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0