brandsoul India - salary not disbursed yet

I had a brief engagement with a company named Brandsoul India (brandsoul.co.in) with their head office in Kolkata. After working for around ** days from **th July ****, they suddenly terminated my employment and refused to pay my dues alleging I was not performing well. I wonder how could they evaluate someone's performance within ** days which included Saturdays and Sundays. Now I want my salary be paid. I tried to reach them through email several times but without success. their offer letter bears no company address or contact no. or even an undersigned. Their website has an address of Kolkata and I have the address of the HR Lady who I thing was the mastermind behind all this as she is the one who mailed me about my sacking