Sahara Credit And Cooperative Socity limited - Invested Claimed Amount not received

We invested the money in Sahara Credit Cooperative Society Ltd in **** and reinvested the received amount in ****. It reached maturity in **** but the amount is not received yet. We contacted the officials several times in the last * years but always received the same response to wait, it will be credited to the account. In the recent call with one of the officials, they told us either to wait for a few months (which is their general response) or you can start MIS in which a certain amount will be credited to your account for **+ years monthly. We are not sure to trust them with this alternate option. Please provide the suggestion for the same whether we should wait so that the whole amount will be received (as said by them) or start the MIS. If not both, what are our options to get the money back?