@Sm1smom, I contacted the Senator's office, and yesterday I received this message from the office: "According to USCIS electronic records, this case is currently located within the jurisdiction of the New York Field Office. Your inquiry is being reassigned to our colleagues in that office so that they may assist you."
Today, I contacted the USCIS again, and I was told our applications are in process of transferring from the Long Island Field Office to the New York City Field Office!
I don't know why they have transferred the applications there (which is 1:30 hours drive from where I live), and it seems another user "ChillyPenguin" in this forum had a similar complicated issue in 2018 (i.e., transferring from the Long Island FO to the New York City FO)!
Do you have any advice on what I can do at this time? Thank you for your time.