Apex domains cannot have CNAME records.
Question and response
Question
dig citywest.ca. NS
Answer
citywest.ca. 1 NS ns1.citywest.ca.
citywest.ca. 1 NS ns3.citytel.net.
citywest.ca. 1 NS ns2.citywest.ca.
citywest.ca. 1 NS ns4.citywest.ca.
Authority
The response has no authority records.
Additional
ns1.citywest.ca. 1 A 24.244.65.133
ns2.citywest.ca. 1 A 209.145.111.227
ns3.citytel.net. 1 A 209.145.111.62
ns4.citywest.ca. 1 A 20.151.83.149
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0