Regarding minor Passport rejected of a single parent

Hello Lawyer/s, I'm a single mother and had got divorced in 2021. Recently this year in the month of Jan 2024, I had applied for my minor kid's passport. Somewhere around April, I had received an email from Passport office to visit RPO regarding some documents. When I visited the RPO Ahmd , I was told to write a declaration to include the father's name, for which I refused. After waiting an entire day, I was able to speak with the RPO himself. After requesting of my case, that my kid doesn't know his dad and I as well am not aware of his whereabouts, the RPO did consider and told me that I would be receiving the passport in the next 10 days. Inspite of sending emails, or calling the number provided each month thereafter, no one picked up now replied to any emails. Finally on Sep 3, i included the chief officer of Passport for understanding the reason why was the file closed when I was told that i would receive it on my visit to RPO. The next day , i had received reply from RPO saying, that they had sent some post relating to FCI for which they received no reply and hence closed. Here, I did enquire my neighbours and my father if they had received any post in my absence and both replied negative indicating nothing was delivered to them. Now around 6th Sep my neighbour received post from passport office. Upon my request to send to picture of the same, the letter mentions about reference letter sent. In the month of June related to FCI and that since the file is now closed, I should reapply. I'm now confused completely. I do remember I wrote a declaration at passport office for not including the father's name. The RPO has not disclosed any reason stated in the FCI in the email communication. Inspite of mentioning the fact that I never received the FCI post sent by them in the first place, I feel that they simply ignored it. How can I get them to know that we never received the post in first place , neither any communication about it be it sms,email,phone etc. How can I get them to reopen the file again. I waited for 9 months after applying the passport, after being told that i would receive and now there is no clue why the file is closed. No reason given. Looking for some guidance here