Airtel — giving misleading information in airtel app.

Last month i recharged my number of 100 rupees which was not of any validity. Means in app it doesn't show that this recharge also comes with any validity, but after 28 days they have deducted 45 rupees and there's a message that after another 28 days the remaining amount will also be deducted.
The point of complaint is if app is not showing any validate period of recharge then how come it deducted amount.
The only case is of misleading information.