• Tata Docomo DSL internet billing after disconnection request

DSL connection No.-[deleted]. 
1. I stopped using my internet connection in August/ sept. 2012, talked customer care to close the connection as I was out of station, but it did not happen and I get the bill call. 

2. Through e mail on 3 oct 2012, again I requested to close the account.

3. And I have tried to ward off the issue by paying the last bill in Dec 2012 hoping the same that the account will be closed when I have not actually used the connection during this time, but In fact , this activated my account started billing automatically against my number which now they want me to pay.

4. But it did not happen, Instead of disconnection, Number get activated automatically, and again I was charged for the unused internet connection till it get disconnected automatically, ( so tata docomo charged the bill till 2 feb 2013 ) 

4. Following are the complaint numbers generated during this time: 334877997 dated 7/11/2012
 
5. Again in 2013 , i received some legal calls for recovery of the bill. And i talked with tata customer care executive in pune. I talked with the customer executive with complaint number
348278981 dated 09/02/2013 

Then he assured me the wavering of the bill, Complaint number:Complaint number:348280415, dated in 2013

6. Now in 2015, I am receiving the same kind of calls for recovery from some legal firm and asking to pay 2561/- rupees, So communicated with tata customer on mail, but with out any concrete reply.
 
7. Now tell me, what to do, when some alleged legal person calls you in between while I see patients or doing some imp other work, to pay the bills of sept 2012.
 
This is mental harassment and one kind of bullying. And i want to address it now legally for the benefit of all others.
 What are the actual ways to respond to Tata Docomo's legal notice which actually I have not received as I have been relocated. I wan to encounter this case in legal way instead of going for settlement.
What all learned advocates suggest me on this case and any other way of consultation to them ?