Regarding not receiving revealing and experience letter.

Company where i use to work was continuously reducing my salary and hence i wanted to resign but mgmt. wanted to terminate me rather then to accept my resignation. In between, I quit going to office for around 3 weeks and HR department sent me a abscond letter and hence i rejoined again. I received the remaining 1 week salary, continued to work for two more months and finally resigned (via email and served notice period). Its been 1 month and my final settlement is pending. I am not impatient for the formalities like experience letters and others as it takes time but i have doubt on my companies intention. MY questions are as follows: -How much time does an organization can take to finish the formalities? Is this legal? -I am very much concerned about my revealing letter and experience certificate and doubtful about company intentions. May i ask , if they mention any negative comment, will this be lawful can i take action against it (as company is willing to do that). -I have not received my previous 8 months salary slip, how will i cross check the gratuity amount and PF amount given by company is correct. -Company has done the same with previous employees (Terminated and mentioned performance issue in experience letter) hence i am concerned. (In this company either you work or you will be terminated and get your future in trouble). Things that may go against me: -I have not submitted my company ID on my last working day, HR said it will take time to release the letters and i assured, i will submit my ID on the same day when i come to collect letters and final settlement. -Around 6 to 8 months before, company issued performance warning letter but mgmt. let me continue after that. -I have received abscond letter (as mentioned earlier) from HR but have continued after that. Received salaries continuously. -No proof that company has accepted my resignation. (No resignation acceptation mail, no separation mail). After one week from resignation, i sent an email to HR to inquire regarding the formalities to be completed and demanded for salary slips but no reply till date. Its been 8.8 years i am working with the organization, its a trading firm where payoff is shared between employer and employee. currently i have made losses in the market (its not illegal as its a part of work) however its clearly mentioned in our offer letter that employees are not liable to pay against any trading (work) related losses. kindly suggest and help Thanks and regards Nishant