What to do if you changed the DNS of a foreign domain?

Question

Domain Name System

There is a domain, literally 20 minutes ago I received an SMS that it is unavailable.
Looked at configs on the server - everything is OK. Other sites with the same configs work without problems.
In whois , I see that the dns of the server is different, not the same as in the panel at the domain registrar. I already wrote to them in support, but it's a long time. Therefore, I will ask you if I can do something myself to quickly restore the site? It looks like some kind of verification is needed, judging by the name of the new dns. Verification of what? How to pass it?

Answer 1

With a probability of 95%, verification of the contact email address specified by the registrar is required. You should receive an email asking you to follow the link. Look in spam.
If you registered the domain yourself, go to the domain control panel, there should be a resubmission function. If through a hoster, then write to them, they can send the letter again.

Answer 2

personal identification can still be.
ask for scanned documents.
which registrar?