How can I get my money back

I am from Hyderabad and I gave rupees 10,00,000 (White Money) to my Neighbor as his wife's heart Operation for a period of 3 yrs 6 as of now. We also wrote an agreement with 100 rupees stamp paper for 6 months by keeping his Original House hold documents as surety and in the agreement it is wrote as 2% interest for each month.And Mentioned in the document like, if he fails to give Total amount then we can proceed to take the house legally. But the problem is he did not pay me any interest for almost 15 months now.When I asked him about it he is telling that he is waiting for the Mortgage Loan to clear all my amount in one go. Finally the day came and how he is asking the Original house documents to submit for Mortgage Loan. After submitting the house documents then only he can able to pay the amount to us. If not he is helpless to repay the amount. Please advise me whether I need to give him the documents or not? Since these 15 months, his behavior is different and he is not giving me proper response to me while try to discuss the repay amount. I have told him that, once he pay me my 10,0000 amount then only I will give him his House documents. Now, I am getting the calls from my corp orator to come and meet him. At last, i went to him and told the same. These days, I am getting some calls from Local Rowdy cheaters to give the documents to him to get the loan. At last, got to know from negihbours that, this guy has take nearly 8 lakhs amount from the surrounding neighbors and telling them that after getting the Loan he will settle the amount. Please advise me how to get my 10,0000 amount back from him. Thank you in advance.