Question : Empoyer is harrasing me. what should i do?

I have recently resigned from a company telling them to reduce my notice period. They have stared harassing me after resignation to complete the pending work. I did my work with triple capacity without taking any break because I wanted to get relieved from my company as soon as possible. After completion of work, employer is not considering to relive me. They keep telling me, we will see and get back to you. They have harassed me so much that I got depressed and my mental health is falling now. I did email to my HR that, please consider my today as the last day. But, they keep telling me to come office and do the work. when I have asked, can you tell me what is pending at my end. They have no response. Since, my health is falling down. I am not able to go office. I am not sure if they going to pay my salary or not. If they will give reliving letter or not. Employer's intention is not good for me now. They are trying to get me into office by anyhow. What should i do ?