I booked at flat in Webcity in 2014 with a promise that it will be delivered in 2017. In 2016, they said flat will be delivered in 2018. When 2017 came, they said it will be delivered in end of 2021.
So this is a never ending cat and mouse game.
I would suggest buying read for possession type of properties only.
Avoid Mantri. Very poor service.they just want to collect money and keep delaying projects.