I received pamphlet from Hathway and it says 25Mbps 1TB at Rs399, 50Mbps 1TB at Rs449.
I called up their sales rep and he said that we have to pay one time 'activation fee' of Rs1500, after that we can get 50mbps at Rs449 without taxes.
Valid only for new customers and existing ones cannot take it.
Talking about delhi, maybe they are doing same thing in other states.