Bharat Sanchar Nigam [BSNL] — Refund of my deposit amount on surrendering Landline

Address:

BSNL Nagpur

I have submitted my closure of landline form on 14.08.2018 for my phone number[protected] with my cancelled cheque of ICICI bank.
BSNL officials at Nari Branch Nagpur told me that deposit amount will be refunded in 2 or 3 months, but I did not get any amount credited to my ICICI bank account. Even after so many visits, the problem not get solved.
This will really create bad image to BSNl and customer dissatisfaction towards BSNL.
Hence BSNL has to be sued for total deposit amount along with interest.