How to delete nameservers records in vps

I was trying to delete ns1.something.com and ns2.somthing.com records from the DNS functions using cPanel.. however the records has been successfully erased.. but when I go back to Nameserver IPs under newtworking setup.. I 开发者_如何转开发still can see them there.. is there any specific file I can access on my vps so I can remove them?

In CPanel? I think DNS related operation need sometime to go into effect. Just wait and try logout your CPanel again.