Threatening in workplace

In all probabilities your manager shall not be authority to terminate you. He may have a nuisance value.

In your appointment letter company might have mentioned that you shall be extending your services at the position of...........or for any other duties assigned to you. If the position offered to you at the time of selection is lying vacant you can make a gentle request to your appointing authority in writing under acknowledgment that your qualification, experience, skill and interest is for the position applies by you and offered to you vide appointment letter issued to you and you should be assigned duties accordingly.

If the company does not accede to your request you can submit notice of resignation and separate.

If you are being threatened at work place you can lodge a complaint to your appointing authority, Head-HR, in writing, and if required to o/o Labor Commissioner.