Cash dealings under signed blank cheque

Sir, I have given an amount of Rs.3lakhs to a person for mutual benefit travel business purposes with an intention to attach my new vehicle in MNC IT Company with 5yr Rental Contract basis.Due to an compulsion situation,I have given rs.3 lakhs under oral confirmation that within a month that amount with 4% interest will be given back to me with an security for this,he provided me an signed plain green sheet with signed blank cheque of an small finance bank. But the person not stand on his promises soon after taken money from me.With multiple attempts i spoke to him regarding this,he said due to unexpected reasons he can't provide money as per his promises and instead he will be provide part payment for initial amount to buy a new financed vehicle, but not stand on his promises and demanded within 3 to 6 months full payment will be settled, meanwhile providing an 4% interest of rs12000 every month till final settlement.2 months he transferred interest amount to my a/c of rs12000 after 2 months he made an payment of rs50000 & rs35000 on 3rd month and then he repeated given time delayed false promises for transfer of remaining amount ,for past 1month he not even attending calls, not to seen him in physical,not respond to anything.About him he owned an new vehicle sedan category and doing multiple business in various fields (same business with multiple names), such as food business, travel rental with 20+ vehicles,etc,. all are under mutual benefit agreement,also operated an charitable trust. Currently I'm in serious financial trouble. What I can do now? Please advice me.