Company terminated me without given reason

I work with a private firm in delhi yesterday the company's HR called me and suddenly asked me to leave. She said today is my last working day and i do not need to report any further and they will credit my salary in my account. This was so sudden that i couldn't understand how to react I've been one of the oldest employee of the company and was working really hard for the company. When I ask what is the reason for doing so they said there is no reason we just don't want you in the company and when I cross questioned My COO said its a joint decision of 4-5 people and I alone can't say anything and then I said Ok if its a joint decision then lets have a meeting and discuss about it that what's the problem with me so she said call me tomorrow and we will discuss about it and then she is not picking up my call. Please suggest some thing as I am really worried as I stay alone in delhi and I have no one to depend upon.