Indusind Bank — threatening calls from agents

Agents from indusind bank calling to their relatives instead of calling to that correspondent person, relative peoples are not at all going to pay that money. Even they don't care also but unnecessarily relatives are getting into the depression often getting calls. I knew only these peoples are behaving like a boss to the middle class family. They don't have guts to take action against the people who looted money and escaped from india. If one month not paying, anyhow you guys going to put interest on it then why threatening and all?
Am going to write a letter to prime minister mr. Narendra modi regarding this.