Secretary not giving noc for bank loan.

I'm the Chairman of the Society and I have sold my flat but the buyer has taken a bank loan to make the payment. I do not have any maintainance due but there is a dispute going on with the Society over conveyance amount and the secretary is asking to give blank cheque only then he'll issue NOC. As, he is saying it was passed in the AGM all 3 committee members will pay equal amount to settle the dispute. Both the secretary and treasurer committed fraud and stole about 2-3 lakhs from society which they still haven't showed the Receipts of, but the Society blamed all 3 of us as I had signed the bills trusting them. What are my options in such case, please answer.