Idea Cellular — Unethical behaviour, threatening me by phone by notice for payment of already paid bill and closed sim

Address:

Bhopal, Madhya Pradesh

My self anjali shrivastava i had purchase 3 postpaid sim but after some time idecide to surender 2 sim which is not in use idea customer care executive told me on phone that pay all overdue charges and mail written request on [protected]@gmail.com then they close my both sim i pay all bill amount and mail them with payment proof receipt. Then i thought sim is close.
But after some time they again starts calling me for payment of further month again i told them about mail.Then they start threating me form different number that they are calling from consumer forum and they are having frozery case against on me i told them i already clearall overdues but very harshaly they replied me that ihad to pay all what they demanding then i denied to pay .
They send me notice via advocate NITIN SINGH BHATI . Mob. [protected] on 14/07/2015 for payment of Rs882/- & Rs921/- respectively
and today 01/08/2015 one man called me by Mob.[protected] he told me he is SI of Allahabad police and having a forzery case and very badly he told me for payment of dues amount otherwise he process my case to local bhopal police station
They are mentally harrash me i am totaly frustate what i can do seriously they puzziling me very much even i cant work in my office pls help me i am having proof of email and payment receipt, enclose here with