Citizenship

My experience with USCIS is too hard. I have submitted my application for citizenship at April 2019. After two weeks was scheduled for the biometrics meeting in 20th of May 2019. Everything was going well. I had to wait till December 2019 to receive a letter schedule for citizenship test at 27th January 2020! Everything was fine in the interview with a very nice lady. I passed the test in first few questions. Was friendly meeting. I confirmed my request to change my name, the officer was very cooperative.
Thus, I was waiting for the patch ceremony since January 2020. Only by September 2020, uscis updated my case that I must respond to a RFE was mailed to me at March 2020!!!
In my first call to uscis asking for a copy of this missing RFE note, I was told this is a system error there was no RFE sent to you. No worries!
After two months of no updating my case saying I must respond to the RFE, I called again : was told nooo worries, relax. I asked for a copy of the RFE, was told since it's expired I can't see it!!!
After anither two months in January 2021 I called USCIS again and was told they can't find the RFE!!!
By the way: I have the USPS electronic records for all 2020 mails to my address : There is no one mail to my address!!!

I'm still stuck, uscis is waiting for my answers to questions I didn't receive!