Legal notice for a connection which i had long back cancelled

I used to stay in Pune during 2009 and had a Broadband connection from Reliance , i vacated the place and cancelled the connection.
Following was the Account info :

Billing Account No: 100000111251483
AC no: 100110587548

User id : 285855025063

Following is the Termination Request ID:

reliance termination request id:
100792666

I moved out of that location in June,09 and after that also I was getting Bills in Email for several months and that bills also showed DUE amount as Zero.

Now, after these many years i get a Legal Notice from them asking me to pay some 150 Rs.

I dont know what is that amount for.

This was the reference given for the Legal Notice:

WITHOUT PREJUDICE
Ref No:-180+ /BC 23 /PUN/1024/NOV 2014
Name :-MR MAHAMMED IMTHYAS
Address: –FLT N-501 C1 WING KUNDAN ESTA TE PIMPLE SAUDAGAR.
Subject:- Demand Notice for Recovery of Outstanding Dues
Account ID – 100000111251483

Please help me with this