The Bi-Collective Delhi is a voluntary support group. At the moment, they do not have a helpline but you can always write to them at bicollectivedelhi@gmail.com for information, access to books and general questions regarding bisexuality. They have made their collection of resources (brochures, reports etc,) received from bi-resource groups in the US public. You can reach out to them for all the resources and they'll be more than happy to share them across. The more we learn, the better. You can also listen to their recently released podcast, Passing Bi on Spotify.
The Bi-Collective also hosts meetings (online ones too) occasionally where they discuss issues related to bisexuality. In case you wish to be a part of these meetings, you can message them on Facebook/Instagram or write to them.