Punjab National — amount debited from my savings account without my permission and notice through payumoney

Address:	110085
Website:	www.pnbindia.in

I have a savings account in punjab national bank prashant vihar branch. On 4th february a transaction of rs. 5625.24 was done through payumoney app from my savings account which was not done by me. Please note that i have never ever used payumoney application as well as i am not registered with this app. I did not even received a notification regarding deduction of my money. Pnb users have been facing alot of issue regarding their facilities and therefore we were not able to update our passbooks. I have registered a complaint at pnb's customer care number but they are not assuring anything. At first they said this would be resolved in 2 days and after 2 days they say that it would take minimum 45 days. Bank executive are also not saying anything on this matter.
I want my refund back. And no clue would i get my money back. This is something just not acceptable by punjab national bank. Scams like this would hamper not only our accounts safety but the loyality they share with the customers.