Yes, you can. First give a reminder in a polite way to your HR people telling them of the urgency for you to go without giving specifics and reasons. Send this to them in writing preferably through email. Keep a copy of that email at home. If they still do not allow you to leave, approach the National Human Rights Committee and lodge a petition with them. They should help you out. Lastly, you can always go to the Labour Office and seek assistance. .