I recently resigned from my position, providing a notice of four days. While HR expressed concern, I assured them that the transition of my duties would not be an issue, given that most of my tasks had already been unethically reassigned over the past year. During this short notice period, I conducted a thorough demonstration of each task on the list (list made by the users) for the benefit of users and other stakeholders, ensuring a seamless knowledge transfer.
Afterwards, I dedicated additional time, particularly with the individual who took over my responsibilities, addressing any challenges he faced in the processes. The department head, Mr. X, sent a confirmation email to my reporting authority, approving the handover process. Everything seemed to be in order.
However, it's now been five days since my departure, and I have not yet received my release or experience letter. Despite reaching out to HR (with a copy to Mr. X) via email, I have not received a response. Upon inquiring, I was informed that a senior person, possibly a Director, is causing a delay in the release. I suspect that there may be internal politics at play, possibly involving Mr. X's department, where my tasks were reassigned, with Mr. X being the main foul player. The reasons behind this can be (a) I raised several true yet unpleasant questions (like taking away my tasks while I was still there) which have made him agitated, (b) given the way I single handedly handled the job since more than a decade, they are very apprehensive about the future, and (c) other reasons not known to me.
In the meantime, I received an email from my reporting authority after my last day, inquiring about my availability and potential support in the future, given the short notice. I have not responded to this email.
Given the circumstances, what should be my next course of action? I of course need the release and experience letter.