I had joined a startup 1 month back. I had worked their sincerely for 1 month. I have job joining mail also with salary breakup, they didn't give me hard copy of offer letter ,they also opened my salary account, but at end of the month they said that your performance is very low so you leave the job, when I asked about my salary they said, what do you mean by salary you have not done any work. So please suggest me what should I do