Apex domains cannot have CNAME records.
Question and response
Question
dig unipago.net.do. NS
Answer
unipago.net.do. 4 NS ns-1409.awsdns-48.org.
unipago.net.do. 4 NS ns-1805.awsdns-33.co.uk.
unipago.net.do. 4 NS ns-375.awsdns-46.com.
unipago.net.do. 4 NS ns-574.awsdns-07.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0