US Immigration from Hungary

So, our I751 has been pending since 12/2018. The last update we received was in January 2020 stating that the case was transferred to the local office.

In August, we made an Infopass appointment. We drive 2 hours to the Infopass appointment and they told my husband he could not have a stamp because his N400 interview was scheduled and his I751 would be taken care of the same day. So he went without a license and proof of status for a month.

In September, we go to the N400 interview. Everything goes well, but they tell my husband it can't be approved because they don't know where his I751 is and they can't find the documents. They tell him a few more weeks and send him out the door.

He comes out and tells me (since I wasn't allowed in) and I obviously freak out that they claim to not have or know where the I751 is.

I go up to the door and demand to speak to someone since my name is jointly on these applications, I felt I had the right to be told what was going on. The supervisor comes outside and we discussed the issues in front of literally everyone in line (which I felt was inappropriate). He fed us BS lines that the office processing thousands of applications a day, then he told us our I751 was in Vermont, then he said maybe they'll find it later, then said maybe its at the NBC, and even smugly said "if we determine your marriage legitimate we'll approve it". I was very upset and crying. He could not give any explanation about why they told my husband our I751 was missing.

I did a few case inquiries before that stated the I751 was in line for an interview at the local office. We were told it was there a month earlier and well now it suddenly vanished.

We literally had to beg for a stamp so that my husband could renew his license and start working a new job being he just graduated and got his nursing license. I can't believe people have to beg for these stamps...

Anyway, the stamp expires in October 2021... I was guessing we'll be in this situation for awhile. N400 completion date changed to 01/2021 on the account.

Last week I did a case inquiry and the email said the case is "pending decision we can not provide a completion date" at the local office. I feel like they're messing with us. I wrote the senator and got back the same exact thing "pending decision at local office".

I don't really know what "pending decision" means, hasn't it been pending a decision since we submitted it?

I am just really confused as to why they told us the I751 wasn't at the office, when with every inquiry we're told its at the local office. Are we missing something from the story? Are they just not telling us something? Anyone been in a similar situation before?