Thank you and sorry to hear about your case. I contacted the congressman to help me with my ROC that was still stuck in the biometric reused status and I had to do it because I already did my n400 interview. My IO was not able to approve me on the spot because my ROC case was not yet transferred to his jurisdiction and my ROC was already pass the processing time. My ROC was under LIN and I filed on April 28, 2021. I called the congressman just to talk to a real person after being answered by an AI when I tried to call LIN about the inquiry I submitted. Your case is different from mine. You are still lucky you got ROC approved without interview. Congratulations for getting your ROC approved. I think you will have to just wait patiently for your N400. Once it’s pass the processing times and it still not moving, then you can submit inquiry or call your congressman.