Denying the releiving formalities

I have 2 weeks notice period which I served after, giving my resignation email. I tried contacting HR he rejected trice my calls with text "ill call u back" during the notice period. And contacted after the 2 weeks notice period was over. He used bad language,and also said that he can increase my notice period and wanted me to continue for 2 months,instead of 2 weeks( as mentioned in offer letter). Also threatened that he'll lodge a FIR saying "employee missing without company's assest(laptop) , which was 2 to 3 days after notice period and the 1st tine he called me on the resignation topic. After dropping few , HR agreed to releive me , and agreed to give releiving letter on sane day when ill submit the laptop and final settlement within 1 to 2 weeks (on mail), also asked about my full address to send a registered AD . I asked for soft copy but denied with a reason. After returning the laptop the very next day he asked for it ,he has not answered my text (where is asked me for full address to send a registered AD)