Bharat Sanchar Nigam [BSNL] — security deposit refund for the landline

Address:

Hyderabad, Andhra Pradesh, 500018

I have disconnected my landline and returned all the devices in the bsnl office on 19/8/2017. Bsnl has promised to return my security deposit amount within 60 days. This is 621st day i. E., 1 year, 8 months, 13 days from the date of disconnection till now you didn't refunded my deposit and i have visited bsnl ameerpet branch 20 times but no positive response. You people charge late fee amount if we pay the bill after due date, i am eager to see how much penalty bsnl is going to pay for me.