Hi Dinesh, There are mixed reviews about the builder online, you can check the links provided https://www.commonfloor.com/forum/55fadb0629274-gruha-kalyan-is-fraud-company https://www.commonfloor.com/forum/558a3fe471ebe-gruha-kalyan---are-they-reliable-and-trustworthy-
I would suggest you not to believe online reviews blindly rather go and visit some of their completed projects and check the construction quality and talk to some of thee owners if possible.