Postal Life Insurance [Pli] — Maturity amount not received

Address:

Kolkata

Policy number: MP151202CC
The policy matured on Nov, 2022 and I had personally submitted all relevant documents at Beleghata PO, Kolkata on 21st Nov, 2022. I was assured of receiving payment in a month. It has been 4 months and I have visited their office 4 times but I am yet to receive money that rightfully belongs to me. They misguided me that my documents are required to be sent to Madhya Pradesh as policy is not online. But officials from MP confirmed that as it is a CASH policy, no need to send to MP. They also confirmed that they had never received any maturity document from Beleghata. All mail communications are available with me.
Now I want my money with due interest and also the fine for undue harrasment I have been meted out.