Actually it probably would not happen to any of us. If it happened to me, at least, I would be on top of it right away, document the calls, emails, etc. None of this was done and a lot of time has passed. Apparently it was not that important to take care of and now there is less leverage/evidence to take care of the issue. If it was let go this long, just let it go, as one person responded, if it was not important enough to save the email, document the calls, etc., it is not important enough to worry about.