Wazowski said:that's what I am talking about, they didn't tell me about that at the time of the interview.
I was told that everything is in place, they are only waiting for the namecheck to be finished.
You probably already know this, having gone through the green card process: CIS is not responsible for its own mistakes. Thay pay no penalty for their screw-ups. If they had granted you citizenship anyway and "discovered" their error 15 years from now, they would revoke it. So consider yourself "lucky" that they caught it now rather than way later. If you had then sponsored someone for a green card, even their green card would have been revoked in the future. Unfortunately, there is no law to penalize CIS.