Guys I got the Jiofiber in my apartment today. I am from Navi Mumbai.
About 2 months ago, they did the cabling in my building. I had contacted customer care a month ago and asked them to send their sales guy to take the order, now that the cabling was done. They just gave me a reference id but nobody contacted me since a month. Then last week, their sales exec himself came and went from door to door explaining the preview offer.
So please note that they themselves come to your door inviting you to avail the preview offer. You cannot call the sales guy randomly and ask for a connection.
After I submitted my form, order was raised the next day and engineer came on the very next day for the installation. Activation was done on the spot and everything was so seamless.