Provisional Committee member threatening another committee member

I am a member of the provisional committee of a Building which is under the process of Society registration. There were difference of opinions on a whatsapp message that I posted without targeting any specific person. The message that I posted was "I have a strong objection on person taking decisions without discussions". One of the committee member (acting as a chairman) took it personal and yesterday afternoon threatened and intimidated me. He also used swear words like "MotherF*ker" and "Don't teach me how to F*k". This was verbal and I don't have any proof as a video and audio. How do I go about it? I'm located at Thane, Maharashtra.