How to stop recovery agent calls and visits for Collection and harrassment

I took a personal loan of 2.5 lakhs from a well-known NBFC finance company on 2017 and till 2019 Feb am paying EMI's on time. They offered me a top up also for my regular payments and I took when my mother was ill and joined at Hospital. For these two EMI's up to 2019 Feb 19 have paid on-time and due to my last company closing and nil receivable payment from my last worked company, have skipped my payments through due date. But adjusted all EMI's before month end for all EMI's by taking other hand loans. Since last month that option not worked and explained everything to collection agents and requested to wait till this month end. But they dint listening and continuously calling and visiting my home when am out of home. Threatening my family members as they are filing a case against me to collect or they take all my love property as recovery for my personal loan. First they are calling me and enquiring me about my availability and after when I said am not at home, they are going to home and insisting and forcing my family members to pay or do something to pay (I can't explain the word they used). Need a suggestion against this to stop and file a complaint against first on collection agent / boy and to stop that NBFC Finance company to wait for one or two months. Kindly advise.