[Resolved]  Airtel — Deducting money from airtel account

I was just trying to run Whatsapp app in my Trio mobile, and what i get is messages poping up on my screen saying "Thank you for purchasing the iappgame. Enjoy and Have fun! [protected]@iappgame.com" and next message saying "Thanks for using APPS. You have been charged Rs 3.0 from your airtel mobile account. For more service, call 56789" balance was deducted. After talking to customer care i got half of the money refunded. but my complaint is about the money being deducted without asking that "you are purchasing this app and it would cost this much amount would be deducted do you want to continue?" The customer care executive said that it is always mentioned on the link where you click that how much amount will be deducted but in my case there was nothing. I have uploaded the images so that you can see what i was trying was not any link. just opening an app. Details: Date 01/01/2016 Time: around 6:30-6:50