Harassment from star loan app

Last month I have taken a 3000 loan from star loan for 7 days and they credited 2100 in my a/ c after 7 days I have to pay 3100 . After 7 days due to some reason I couldn't pay on time so they use to send me reminder msg daily but no reminder calls from thier vasooli boys just msg .suddenly 4 days back I received a call from star loan and loan amt politely I said them plz provide me loan sanction letter from your company and take your money so he started to talk vulgar words .after sometime if you pay today I will give discount I said I dont have money right know so he said at least pay 1000 rs and settle the matter I said no and he disconnected the call. Suddenly today around 12:45 I received a call from star loan vasooli boys and said me if I won't pay by evening they will call all my contacts it's an warning and if won't pay today from tomorrow I will get calls from other vasooli boys batch beware and disconnect the call.so my problem is what next I have to day against these vasooli boys ? Plz help me