Airtel — Refund not credited since Jul 2022

I recharged via Net banking on 13-Jul 2022 for an amount of Rs 455, the amount was debited but the recharge was not successful. I got a message from Airtel stating a refund will be processed, but to date, I haven't got the refund.

Transaction date -13-Jul at 6.30 am
Amount -Rs 455/-

On 13th Jul, I made 2 transactions towards Airtel. One was @ 6.30am failed but amount debited, second @1.30pm which was successful.
First transaction amount is not credited.

I have been complaining Airtel team via call, escalated on facebook, and visited the store and via email, all the time they are saying the funds are held by HDFC, but my bank replied the funds were settled to Airtel.

Airtel team cheated by taking my money.