inquiries didn't help us. We are now filling out an ombudsman form. From my understanding if you have complaints about the USCIS, this organization is your next step after submitting inquiries. We had two calls where we tried to talk to a TIER 2 agent at USCIS. Both were unsuccessful. They straight up lied that they already contacted us and explained everything when we had the second call.
https://www.dhs.gov/topic/cis-ombudsman/forms/7001
https://www.dhs.gov/case-assistance