Sahara Credi Cooperative Society LTD - Maturity amount not paid

I am an investor in Sahara India Credit Cooperative Society Ltd. (Membership No. ************, Account No. ***********). I had invested amounts regularly over a period of more than ** years in its investor schemes. As per certificates issued by Sahara India Credit Cooperative Society Ltd. at Roorkee, I was to receive a redemption amount of Rs. *,**,***/- on the maturity date of **/*/****. However, the amount has not been paid to me even after more than a month of the maturity date.
I am a senior citizen, aged ** years, having retired from service as a Professor at I.I.T. Roorkee. My earnings include pension and maturity amounts from investments made in the schemes like the one of Sahara India Credit Cooperative Society Ltd. It is a source of great concern and hardship for me that Sahara India Credit Cooperative Society Ltd. has not honored its written commitment of making payment of the redemption amount on the maturity date.
I have been dealing with Mr. Anil Kumar Rao, the local Manager of Sahara India at its Roorkee office. His contact number is ***** *****. Another employee at the same office of Sahara India is Ms. Swati and her contact number is ***** *****. I received monthly cheques of Rs. ****/- from Sahara India from these two people in the last three years. Anil Rao, the authorized representative of Sahara India at Roorkee, told me that the redemption amount would be paid in September this year. In our next conversation, he shifted the payment date to October ****.
I had also written an email to the email address of the company on July **, ****, but, there has been no response so far.
Please help in getting the company to pay the maturity amount of Rs. *,**,***/-, along with interest, from Sahara India Credit Cooperative Society Ltd. without any more delay.