Employer not paying salary for last two months, how can I claim my dues?

I work for a startup in Gurgaon, and my employer has not paid my salary for the past two months. I've repeatedly asked the HR department, but they keep saying they'll look into it. I'm really stressed as I have bills to pay and a family to support. I'm considering legal action but unsure of the process. How can I ensure I receive my dues? What are my rights under Indian labor laws?