[Resolved]  Airtel — Airtel took money from my account without my permission and denying to refund.

Address:	600002
Website:	Airtel.in

I paid my airtel landline ([protected]) bill amount₹.750/- on 22/6/2016.
And to my surprise the amount 750 was debited 2 times. one in the name of "bhartiairtel" and other in the name of "www.airtel.in".
I don't understand everytime i make a online payment visa-password is asked. then without me entering the visa password how did airtel debit ₹.750/- from my account the second time on the same date after 2 minutes i made the payment.
And how did visa allow this to happen.
After giving the bank passbook copy, bank statement copy airtel people are not refunding my amount.
So many mails and calls done to airtel but of no use, everytime a new person talks and ask me to explain from the beginning.
Fed up and frustrated explaining to them.