Tikona — Non cancellation of connection

I had a tikona internet connection with user ID [protected] two years back. In march 2014 i requested them to disconnect my connection to which they agreed, but in april 2014 they sent me bill of March 2014 and then they kept enforcing penalty of Rs 100 per month on that bill and i was receiving threat calls from them.
On 16th of January 2016 i called tikona customer care and they said that i have an outstanding amount of Rs 3110 and after paying that I will not receive any further calls and my connection will be closed (I have not used tikona since March 2014). I paid the amount through internet banking (copy enclosed) and requested to disconnect my amount.
Now today I received a call from Tikona with this No. [protected] and she asked me to pay the bill of Rs 800 within half an hour. She said that it was the remaining penalty and after paying that she will mail me NOC from Tikona. She threatened me that my bank accounts will get sealed and all govt id cards will be seized and I will not get any govt job just because of 800 rupees otherwise i can settle the case outside court by paying Rs 800. She said that she will mail me the NOC from tikona at my mail id after paying the bill of Rs 800. Then I paid the bill because I don't want to take tension of court case and I wanted to settle the issue completely. But after paying the bill i did not received any mail. I call her repeatedly on her phone but most of the time i was either getting busy tone or she was not picking up the phone. Then she switched off her phone. I m feeling really cheated. I have paid so much amount for no reason. I m attaching here bills paid by me.