As I said earlier, I saw 150Mbps plan on the same website a few days back as a CSxxx plan for 1999 if I remember correctly. I also forgot to take the screenshot.It was strange that I saw plans upto 460 ₹. I forgot to take ss then. I was sure I was in kerala circle.
Today i checked with Kolkata circle and the plan was there though slightly abit more costly at 499₹
I assume it is an error that is happening while the site is updating for some other circles.