StashFin — Unknown number calls

In sep'21 i fill stashfin loan application but the end of the application form when they asked to attach bank statement I was quit this application form and not complete it, after one day they credited 9000/- rs in my bank account without any intimation.i was not fulfill the requirements of stashfin loan application then how to possible disbursement of loan amount without attached llbank statement. I was already paid 9000 /- rs and above of them but they also add very high interest and call my contacts and relative and harassed all of them. How could they do that, It's getting a lot of interest on pending amount, I am unable to pay that amount. How did they transfer the money when I had not completed the loan process itself.plz solve my problem as soon as possible. . They harassed me so much, If it is registered with RBI then how can it charge so much interest and how can we hack our contacts and harassed them by calling them.