Bharat Sanchar Nigam [BSNL] — non refund of amount on surrendering my landline

I a. Janaki rani have surrundered my landline on 13.10.2016 bearing no.23304991 situated at 6-3-96, flat 201, ab heights premnagar, khairatabad, hyderabad. The deposit was not refunded till now. I request you to refund my deposit amount with interest immediately. Other wise i may seek justice in the consumer court. I request the concerned authorities to take positive action at an early date.