Apex domains cannot have CNAME records.
Question and response
Question
dig telasera.net. NS
Answer
telasera.net. 5 NS ns3.dnsafrica.com.
telasera.net. 5 NS ns4.dnsafrica.com.
telasera.net. 5 NS ns1.dnsafrica.com.
telasera.net. 5 NS ns2.dnsafrica.com.
Authority
The response has no authority records.
Additional
ns1.dnsafrica.com. 5 A 102.209.21.155
ns2.dnsafrica.com. 5 A 197.85.7.51
ns3.dnsafrica.com. 5 A 129.232.154.82
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0