Airtel — bill not received and deposit amount not released

Address:

Bhopal, Madhya Pradesh, 462022

I port my no [protected] from Airtel to idea on 15.8.17. I have not rec. My last bill while deposit amount before bill generation.
I want my last bill and deposit amount of rs 300/- which is given by me at the time of sim received . customer care said that such amount refunded when connection closed