After the first screen of Happy Browsing, the customer is sent to the second screen which shows you have to choose an option and there is no decline / cancel button.
As the customer thinks that it is PROMO offer from the first screen, he/ she selects the last option as given in second photo.
And after selecting the last option, the shocking part comes in the third screen and it says you have to pay and it will be charged in next bill.
These 3 screens are coming. I have 499 plan and this message popped up today.
The customer care guy told me to get the top up cancelled by visiting the BSNL office.