Is sudden termination legal without warning or documentation proof?

I had resigned earlier because the company refused to provide an appraisal, citing poor performance. I was told to either continue on the same terms or resign. Based on my skills and experience, I chose to resign and served a two-month notice period, with my last working day being 4th February 2025. However, before the notice period ended, I was asked to continue, and I agreed. If performance was truly an issue, why was I asked to stay? After continuing for three more months, I was abruptly terminated without any prior warning, performance review, or written documentation. In April, I supported the team during a jewelry exhibition. Later, my manager, who had planned a vacation, asked me to take one month of unpaid leave. When I declined, I was pressured to resign. Upon refusing to resign, I was terminated, again citing performance, despite receiving no prior negative feedback during my two years of service. I seek clarity on the legality of this termination, my rights as an employee, and whether I am eligible for compensation or any legal remedy due to this sudden and undocumented termination.