You have been communicating to take charge. If your reporting authority/line management/HR has failed to take charge it is lapse at their end. From (your posts and hence) your submissions to your company any one can conclude that you have been subjected to indiscrimination, biased, vindictive, penultimate approach, by your reporting authority, and line management and HR have played as dumb and deaf. All of them have demonstrated that they are adamant and recalcitrant.
Your gentle approach has emboldened them.
It is high time that you peruse breach of trust, and let your lawyer take over.
From your posts it is clear that employer is unwilling to act and release your dues.
If employee has resigned in line with terms and conditions expressed in appointment letter and employer violates the terms and conditions employee can proceed to set and fix the mindset of employer.
The line management and HR should have designated a superior official or HOD to take charge if reporting authority was showing tantrums. Charge is handed over to HOD.
You have granted enough opportunities and since company has not come forward it implies no charge/company property was there to be handed over.
Moreover as your resignation has been accepted all liabilities if any have to fall upon your reporting authority. It is his funeral and he has to handle it. If he is still adamant and recalcitrant and is still showing the tantrums it has to become the funeral of line management and HR. It is to be seen who is willing to be buried.
Request the good offices of your appointing authority to let you examine your personnel file. In all probabilities company shall maintain studied silence. However this shall come handy at appropriate time in appropriate forum.
In a given situation employee can invoke the provisions of Industrial Employment Standing Orders Act, SE act applicable to the state, Payment of Wages Act, ID act as per explanation of employee under these enactments or approach civil court.
Obtain the copy of standing orders of the company.
Company might have extended the standing orders to executive, engineer, manager etc. Employee may refer to the explanation of employee under SE act applicable to state and check if the establishment falls under the SE Act.
e.g.
The Delhi Shops and Establishments Act, 1954
(7) “employee” means a person wholly or principally employed, whether directly or
otherwise, and whether for wages (payable on permanent, periodical, contract, piece-rate or commission basis) or other consideration, about the business of an
establishment and includes an apprentice and any person employed in a factory but
not governed by the Factories Act, 1948 (43 of 1948), and for the purpose of any
matter regulated by this Act, also includes a person discharged or dismissed whose
claims have not been settled in accordance with this Act;
Companies do try to provide fancy designations to its employee and burn extra energy to convince that employee is not workman, however employee should consult a competent and experienced labor consultant/service lawyer who can evaluate employee is workman or not.
Employee can approach civil court.
Under SE Act Company should supply the service/work experience certificate on last day in office. Inspector under SE Act can inspect the records and registers including your personnel file. Be specific in your complaint.
If company has accepted the resignation why it is not supplying you the original copy?
You may submit a notice to the appointing authority, MD, Chairman, Company Secretary to supply you the copy of acceptance of resignation by redg. post and may mention that you are enclosing a postage prepaid, self addressed envelope ( as purchased from PO) for supplying you the copy of resignation by redg. post at once so as to be received by you within next 7 days.
You may act smart and obtain a confirmation even if by email or a recorded transaction (audio/visual) that your resignation has been accepted and your letter and redg. post cover has been received. If you succeed in getting email you may pass it on to current employer and thus be discharged of your responsibility of supplying copy of acceptance of resignation for a while.