Suggest to get documents from comapny

I sent my resignation to my boss and HR head and CMD were also in the loop by official email on 25 Feb, He forwarded the resignation to HR for further action without taking me in the loop. The CMD & HR conveyed that you will get relieving on 4 Mar 2017. It was verbal communication. They did not confirm the notice period and date of relieving on official mail id. HR head emailed the date of relieving to the boss rather than me. I requested to HR head on email to provide the Relieving certificate, Form 16 (providing date), Salary slips with official stemp, share full and final details, Job responsibility certificate (For immigration purpose), No Objection certificate and PF form on my relieving day, but he was putting pressure on me to relieve the company without documents and give threat to me that if he will not provide the documents then what you will do, but I kept silent on that. Moreover, He did not agree to specify the Date of relieving and notice period on Official. As per my appointment letter, the notice period is 30 days. Moreover, Company did not provide the Bonus to their employees and also put the restriction on employee leaves like avail sat and Monday leaves with CMD consent. I emailed no. of mail to HR head, boss and CMD but they did not respond on single email. Please suggest me what should I do?