Tikona threatening calls... From advocate

I was using tikona Internet service for a period of about one year. Due to personal reasons I need to change my residence. In this case I called and sent email to cancel the service. They didn't get the things in time. I left the place in that month end. I got a email bill generated for the next month. Called customer care and checked. They said I there were no usage but still u need to pay bill amount of 413rs for that. I said I already informed u people to disconnect the service and disconnected the cables before I left the place. U people should have closed the account and get ur things from the place on time. After a month u r calling and asking like this?. I sent a complaint mail also to customer care regarding this. It's almost 6 months now. I got a call from tikona advocate stating that she is gone file a civil case against me for not paying the bill. I said I have explained all this. She was threatening me tat my passport will be blocked and all. And I have to pay the money within one hour. Seriously pissed off. I then read through few articles in this forum that many have registered similar complaints against tikona. I thought to write mine and get suggestions. Pls do help.