I'm using hathway broadband from last 4 months I think this one is the best isp in india. It provide some reliable connection and high speed internet.
I've 650 plan in which you get 10 GB with 50Mbps and aftet that unlimited data with 512kbps.
In day time time it provide you 4 to 5MBps speed but night time speed gets little slow 1to 3 MBps, but to me its still the best.
I'd recommend this to everyone.