I am in my notice period and need to undergo medical treatment. As it is a medical emergency, I asked my manager for 4 days of leave and informed him that I would also extend my notice period by 4 days. I had already informed him about this leave a month ago, and it was approved. Subsequently, I submitted my resignation. Please let me know if I will be able to take the leave. He is harassing me and threatening not to provide the relieving letter. Please help...