Hathway Cable & Datacom — cheating and threatening

Address:	Hyderabad, Andhra Pradesh, 500077
Website:	Hathway.net

These are the deceptive emails from hathway trying to extract money though the connection was not there from 2014 year.
They disconnected longtime ago, took the modem later, they said don't worry about bill, computer generates automatically...

We request you to kindly share the proof of disconnection request mail and device acknowledgement receipt, it will enable us to assist you better.

Regards
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They are asking for 2014 year emails... And acknowledgement receipt.

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Dear
Customer, greetings from hathway!! Subject
– concern raised with respect to service related towards
Account number : [protected]
We
Request you to kindly clear the outstanding amount for the
Needful done.
We
Assure you of our best attention at all
Times. Regards
Hyd-helpdesk –
Hyderabad | hathway cable & datacom ltd

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I paid every bill, bills are with me, you disconnect automatically when current month bill is not paid.
Your agent took the modem and spoken on phone to the call center that he is taking modem, your billing department says computer generates bill automatically don't worry about it.
Is this game or what.