I added two NS records to my DNS record four days ago. I did this to use a service provided by the name servers that I added. In order to get them to enable their services, they need to verify that they are name server for my domain by doing a whois on my domain. It has been four days and whois still does not show the two new NS records. The whois server that gets checked is whois.rnids.rs.
Is there something special I need to do to update whois? I've verified that the new NS records have propagated to many DNS servers by
nslookup -q=NS <my domain>. Indeed, the two original and two new NS records are returned.