Money lenders harassing me and my family

Sir my husband had taken a loan of 5lakhs from a unlicensed money lender on interest of 5% without our knowledge. My husband did not sign any documents while taking the loan, he had given 2 cheques which were without CTS. My husband has already paid off 4,90,000 to them but now they are have started charging 10% interest which now we are unable to pay. Now, the money lenders are harassing us and threatening us to give them 10% interest money every month. They have threatened my mother-in-law of killing my husband and harming me physically. We have filed a police complain against them but the police just gave them warning and let them go. Getting warning from the police is still not stopping them from harassing us. Now they are saying they will file a case against us by using those given cheques by my husband which are not signed nor have CTS. Please guide us to what to do in this case. We are ready to give them the outstanding amount of 10000 which will complete the 5 lakh loan amount.