Bharat Sanchar Nigam [BSNL] — refund of security deposit of landline

Hello

Myself manoj negi and my landline no was [protected]. (Area dundigal afa)
In sep 2017 this account is closed as per my request as i m posted to other state, but till date refund not processed inspite of calling so many time to kompally office cntct no [protected]. They are not responded clearly.
In april 2018 they said ur amount 675 processed one month bill not paid by u which is wrong, all dues are clear by me.
But till date not a single rupee refunded to my account accout details and canclled cheque already deposit to kompallly office..

Please do needfull...
Manoj negi
[protected]