I have resigned from a PSU bank after 6 months of service as a PO. As I was not in the condition to resign at the place, I couriered my letter with one month's salary as per their rules. The branch accepted my resignation then. But recently, I got a call from the regional office, and they told me to join the branch again as there are some formalities like an exit interview and so on. However, even now, I am not in the condition to join the bank. Still, I have not received my relieving letter. I am afraid they might take legal action against me. Please suggest.