BSNL — Refund of security deposit not received

Address:

Kolkata, West Bengal, 700028

Surrendered landline no 25001452 in 2015. against customer ID [protected]. Refund has been approved on 01.06.2015. Refund request no is 1-9QBI-1152.
After the said landline has been surrendered and then refund otder has been released,
13 months have passed. We have contacted the designated officer several times but the payment has not been received as yet. No reason is furnished for this incredible ampunt of delay, and the authorities are noncooperative with further enquiries.please look into the matter and take necessary actions at the earliest.