Loan taken from Friends

Hi Sir/ Mam, I was in bad financial conditions and so too money from friends and they lended me totally 1,05,000 and they charged me 10% interest per month which is very high. I paid interest for 7 months. And then I paid them 60,000 and said I won't be able to pay them any money either as interest or principal at I am feeling have already paid them totally 1,30,000 Anna does not want to pay another 45,000. They have lended me money on cash. Not I have repaid my interest through net banking and even paid the 60,000 as principal also through net banking. Now I seriously don't want to pay them single rupee as they have already earned their principal and even 4% interest to their principal. But now they are threatening to come to home and create issue for money. I feel I can sue them in court for three reasons, 1. They are charging me 10% pm interest which is very high. 2. They are not registered lenders and cannot lend me money, but still have done it. 3. They are threatening me and abusing me. Please advice me if I can do this if they really create a issue at my residence.