Net4India — domain name ns update and retrieve auth code

I am using since 2016, and the feedback was very much positive.

However since last few months the service have reduced to 0.

Now i tried 2 different things
1) tried to get auth code, but i am not able to get that.
2) tried to update name server, but its not working.

You can never contact them in any way. No response to helpdesk tickets, no reply to mail, no telephone, chat box nothing working.