Apex domains cannot have CNAME records.
Question and response
Question
dig 12.MegaLink.com. NS
Answer
12.megalink.com. 4 NS ns2.megalink.com.
12.megalink.com. 4 NS NS5.MegaLink.com.
12.megalink.com. 4 NS ns4.megalink.com.
12.megalink.com. 4 NS ns3.megalink.com.
Authority
The response has no authority records.
Additional
ns2.MegaLink.com. 4 A 200.75.160.20
ns3.megalink.com. 4 A 23.152.224.15
ns4.MEGALINK.COM. 4 A 85.234.130.30
ns5.megalink.com. 4 A 88.99.13.51
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0