TTD — Deposit Not Refunded

Address:

Tirupati

I went to Tirumala on 18, 19, 20, 21 December 2021 as per online accommodation booking. I booked 1000/- rupees rooms(2 rooms each day). So I paid 8000/- and I booked one room for 100/- rupees and paid 200/- which includes caution deposit for all rooms(In total 5 for two days)
But I have received only 2100/- as refund still I need to get 2000/-
I have mentioned all details in mail to TTD but they are giving any proper response Its been a one and half month still not refunded.
Please take appropriate actions.
From mail:[protected]@gmail.com
To mail:cd.[protected]@tirumala.org
Room booking reference id's as below:

1.IAJ[protected]
2.IAJ[protected]
3.IAJ[protected]
4.IAJ[protected]
5.IAJ[protected]