You have mentioned that your company has kept notice period of two months in probation period and has extended it to 3 months.
You have mentioned that, you have replied to the email of some official of your company, by your email that you are unable to extend the notice period in your notice of resignation, from 2 months to 3 months. This reply in writing by you should suffice.
Provided you have not given any acceptance to the communication by email or letter from your company regarding extension of notice period. Kindly note acknowledgment of a communication by email does not amount to acceptance.
You have mentioned that "ive had tonnes of requests made to the management and HR but they refuse to relieve me" Probably you have made requests verbally.
Kindly check your appointment letter and see if company has stated that all terms and conditions communicated to you from time to time shall be applicable and acceptable to you.
Kindly submit a letter under proper acknowledgment, addressed to your appointing authority, MD/CEO,HR Head, Company Secretary, stating that you have submitted your notice of resignation dated............on dated...........to Mr......with effective date of resignation as dated...............i.e. two months from date of notice of resignation, as per contention of your superiors that you may give two months time to your effective date of resignation. Due to various personal, professional commitments and also related to your future ventures, you are unable to extend the notice period from two months to three months as already submitted by your communication dated..................addressed to Mr.............in response to his communication dated............and request their good offices to intervene and relieve you on your effective date of resignation i.e. dated..............You should write that you are willing to co operate and help the company to complete the tasks within this date, train your replacement if recruited sufficiently in advance, and therefore their good offices are requested to make the necessary arrangements and supply you the acknowledgment of your letter, and also supply you by redg/speed post, on effective date of your resignation acceptance of your resignation, service certificate, relieving letter, F&F, form 16,PF accumulation reports, PF transfer/withdrawal forms, NOC/NDC etc and ensure smooth exit formalities. You should ask to whom you should submit your company property and then submit company property to the designated employee under proper acknowledgment.
Be gentle in your approach. Maintain your goodwill, rapport, with your colleagues, managers, and use your rapport, persuasion and negotiation skills to obtain a written communication that you have completed all tasks on hand and submitted company property and nothing is pending towards you. This can serve as a NDC for you. Acceptance of your resignation, last salary slip, F&F may be sufficient for your next employer to absorb you.
Many employers, HR personnel try to deny some amount to employee on separation and resort to unethical, unfair practices, and incidence of such practices is ever increasing.
Employees shall have to be well informed to face and counter such employers.
If you face any difficulty you can approach o/o labor commissioner and speak to the labor inspector.