Yes, you can file appropriate proceedings against the PSU if they have not paid you for the work done, without any justifiable reasons.
In fact, not paying for the work done may also be violation of the fundamental right guaranteed under Article 23 of the Constitution, since it is a form of “begar” or “forced labour” as mentioned in that article. Let me point out that unlike most other fundamental rights which are available against “state” only, the fundamental right under Article 23 may be applicable even against a private entity.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.