Mahanagar Telephone Nigam [MTNL] — Security deposit refund not received from MTNL

Address:

Vashi Navi Mumbai

Tel no:[protected]
CA No: [protected] Customer Name : Krishn Narain Mishra
I submitted request for disconnection and returned the hand set to MTNL Vashi Navi Mumbai exchange office on 24 June 2021.
I also submitted cancelled cheque for online transfer of refund amount.
It was informed by the officer at MTNL exchange that refund will be issued within 90 days.
I would like to place on record that so far refund of security deposit is not received.

Please resolve this issue.