Reliance Communications — security deposit refund

Address:

Khordha, Odisha, 751007

I had a post paid connection from reliance communication since 2003 in bhubaneswar odisha. I changed my service from rcom to airtel in year 2017. I deposited security money of 3900 rupees.
Now they closed their office in bhubaneswar. I mailed them and visited to their office in the year 2017 several times. Until now they did not refund my security deposit.
Name nandan srinivas
Address
Plot no 129 a
Satyanagar
Bhubaneswar 751007