My employer terminated me without notice after 5 years of service, what are my rights?

I have been working at a tech company in Bengaluru for the past 5 years. Recently, I was suddenly terminated without any prior notice or severance pay. They said my role was redundant, but I wasn't given any heads-up or time to look for another job. I'm very stressed as I have EMI obligations and a family to support. Is this termination legal under Indian labor laws? What steps can I take to challenge this decision and seek compensation?