Airtel — airtel bank is a scam/fraud. not able to transfer money

This bank is a total fraud to indian people. I have added big amount to my airtel wallet but now getting error when transferring amount to my other bank account. Interested thing is that i am able to transfer money with charge option where 10rs/ 1000 is charged by airtel but getting error transaction failed when i am trying to transfer with upi that is free to transfer. It shows clearly that airtel want transfer charges thats why they shows error when transfer using upi. I have complaint in airtel and sent mail but they are making fool on call. Its a preplanned scam.