Apex domains cannot have CNAME records.
Question and response
Question
dig santodomingo.gov.do. NS
Answer
santodomingo.gov.do. 5 NS ns2.yourwebhosting.com.
santodomingo.gov.do. 5 NS ns1.yourwebhosting.com.
Authority
The response has no authority records.
Additional
ns1.yourwebhosting.com. 5 A 66.96.142.112
ns2.yourwebhosting.com. 5 A 65.254.254.147
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0