Chit Fund Guarantee For My Friend Issued

I had issued an guarantee for my friend in margadrshi chits bangalore in 2013. He did not pay the chit amount which he suppose to pay. I was on of the six guarantor in that chits of amount 25lakh Notice was issued for all the person and no action was taken for the same I have put an chit of 50lakh in the same after confirming them that it will create any issue in 2018 ( no writing was issued) Based on good faith I have put it up Now as I needed the amount to settle the amount for the loan and have bidded for the same. I was suppose to receive the cheque but now They say you cannot take chit amount as you are guarantor for the chit in 2013 and you have to pay for the same Please help me how to clear the situation