Air India — Refund money

I booked a ticket for AI787 date[protected] from Kolkata to port Blair. payment was debited from my bank account but ticket not generated yet.my payment confirmation message is as follow:
Dear customer, acct XXX9189 has been debited for Rs.5615.00 on 17 May 2022 time 08:40 towards linked billdeskpg.( Protected)@icici.Upi Ref I'd(protected)

I tried several times to contact Bill desk customer care and airindia customercare for two hours but lines were not working or always busy. At last, I again booked another flight ticket in same flight due to my urgency and limited availability of seats in that flight.

Kindly refund my money immediately.