Loan lender Harrassment by using unparliamentary language

Dear Concern, Need a suggestion and stop Loan Provider harrassment. I took a loan from a small loan provider through mobile apps by providing all loan related documents scan through mobile app. Took a loan of Rs. 38, 000/- and signed agreement as for three months installment basis at Rs. 12, 666/- per month. Have paid two months EMI and inlast month EMI time my working company hasn't paid my salary and i hadn't paid the last emi due to this reason. Explained the same to loan provider and requested to wait for one month. They charged me interest on daily basis and daily sent a mail regarding my loan outstanding. After a month they strted calling me continuously and answered all calls and told them the same. They called me from Different different number and explained to all persons to all numbers. Since last month they started blackmailing me as they are from Supreme Court / High Court of the state and tellig as they received a legal petition and sending to me and i have to come to the court for explanation. Have said ok on that but they hadn't done the same till now. Again now they are blackmailing me as they are from Police Station and blackmailing me. Meanwhile they unuthenticatedly took my all contacts thrugh the app installed in my phone and calling all my contacts and telling them to suggest me to pay the outstanding amount. They are making me fool or fraudalant persons in market by this way of calling. Please suggest how to stop them and warn them not to do again. I have already given my final day of payment details to them still they are doing the same. Regards. SomeX