These are the world's two major international polls.
They don't just pick random people, there are survey procedures whereby they try to ascertain the overall opinion by selecting a certain group of people based on several parameters.
That's how ALL surveys work. Obviously no one can interview every single person in a country, however the methods they use are amongst the best in the world, you can check their methodology in the report.
And both the BBC Country Ratings polls as well as the Pew Global Research polls came up with similar results. They are both Western organizations, one is based in Britain and one is based in America.
Are you going to tell me that there is some sort of conspiracy going on?
Like I said, Indian denial is legendary.