Airtel — recharge failure but money debited

I recharged my sim for ₹448 via the airtel app using my debit card. During the process, i received confirmation message from the bank about the withdrawal of ₹448. The app kept processing the transaction for long time after that and it suddenly showed an error message stating webpage not available and the translation was cancelled. After that there was no record of such transaction happening on the app nor did the sim get recharged. But the money was deducted from my bank account
Withdrawal of inr 448 ac xxxxxxxxdrawn th pos id:00218905 on 15/04 at 06:27:29. Cl bal: 30, 379.71 cr - indian bank.
I even mailed the customer service email but didn't receive any response