US Immigration from Taiwan

So we were all excited that our immigrant visa interview date (in Taipei, Taiwan) had finally arrived on March 7, 2022. But my wife's case was denied under Section 221(g) because some documents we provided were not acceptable. Since we had lived in China for over one year (2010-2012), we were required to provide of police report for that period. At that time we did get a police report (which was no easy task for a Taiwanese citizen) at that time. However, when it was submitted at the interview, it was not accepted on the grounds that it had not been notarized. We have been told it is nearly impossible for Taiwanese to get this done in China, due to travel restrictions and strained relations. Anyone have experience with this? What can we do?

5 years ago was 2/2017

I lived at an address from 2011-2018.

For the start date, do I put 2011 or 2017?

And if I mark 2017 as the start date, what day? The day that I click submit to make it exactly 5 years?

Does anyone know how to get ahold of someone from USCIS?

As in talk to a real person?

I have some specific questions and it seems impossible to actually talk to someone as their number just routes you to their website every time.

Web chat would also work. I know they have a web chat robot named Emma on their site but that also just routes me to pages on their website.

Got our 2 cases (spouse of US citizen, adopted son of US citizen) DQ'ed by NVC on Jan 26, but are still waiting for the interview notice. I'm assuming that because of a Chinese New Year break it's taking longer than normal. Perhaps COVID-19 is also affecting it? Anyone else in Taiwan waiting for an interview appointment right now?

All the cover letter examples I have seen are pretty much bullett point descriptions of what is included in their i-130.

For the "additional proof of marriage" (visa is for my wife) we only have pictures of our relationship. I figured I would upload maybe 8 to 10 photos and explain it in the cover letter (like a short narrative) to explain our relationship. What do you all think? Is this appropriate or is this not what the cover letters are for? We are relying on the photos because we do not have any other proof of marriage examples that are listed in the appplication (such as joint bank accounts / lease / affidevits). There is an "additional information" form (we are filing online) so maybe that would be a more appropriate spot to elaborate on the pictures.

Any help would be greatly appreciated.