Company can terminate even if the resignation has been submitted. However in case of an employee against whom no charge can be proved, and an employee who is properly informed and advised, this step of the company can be adventurous and may boomerang.
It is not understood why you are taking up the matter with HR, or HR Head, your appointing authority? You may be having some genuine concerns and apprehensions. If you share you can be advised. You should obtain in writing the reason and date of cancellation of your resignation. You should also apply in writing and obtain copy of employee manual, standing orders. You should obtain confirmation whether your manager is authority to cancel your resignation? You shall get all this from HR.
You are being coerced and forced to stay than being coerced and forced to leave. Is it correct? This is also not unusual since companies big or small are full of arm chair managers (including HR) who are good for nothing and they simply can not find replacement or train and nurture the manpower to take up the roles and responsibilities. Simply said they can not train and develop. Training and Development is an important portfolio in any manager’s assignment. Promoters also realize the facts and expenses involved, and hence the trend of service agreements and bonds. The approach of your manager and HR is zealous in your case.
You should complete all assignments/projects as ap and obtain a communication that no work is pending or you may submit in writing with a copy to you that you have completed all tasks and nothing is pending to be done by you. This shall be useful to contest and defeat if company charges you for leaving with unfinished projects and hence causing financial loss.
Dear, you should submit a written representation to the good offices of your appointing authority, MD/CEO, HR Head, Company Secretary, and submit facts and details, as mentioned in your latest post.
Your notice of resignation can be withdrawn by you, only. Your manager as per your post has quoted a meeting he had along with HR with you, while you were on leave. He has probably recorded that during the meeting you have opted to withdraw the resignation, or they have informed that your resignation has been cancelled, thus he has made a false representation. Is it correct?
While you have made attempts to put across that you have not withdrawn your resignation, he has threatened that he will get you terminated, and if you resign again, he shall cancel the resignation. Is it correct? This approach is coercion and threat.
You have not received any show cause notice. If you have completed all projects you can prepone your effective date of resignation and inform say 5-7 days in advance and resign. You may have to tender notice pay for balance period of notice.
If you wish you can lodge a complaint with o/o labor commissioner and you may meet the labor inspector also.