After almost 40 years, I was terminated due to exceeding the allowed time period for medical leave. That's fine, since I can't do the work any more.

The problem is they didn't formally tell me I'd been terminated; no letter, no phone call, nothing. It came up in conversation, when I called the main office for some information and it was casually mentioned that I was terminated. I called human resources, twice, and wrote a letter asking for a simple letter stating my last day of employement...they never responded. I slaved for this company for many years, and had to endure numerous surgeries on my body due to repettitive motion injuries, I didn't rate the courtesy of a letter telling me Id been let go?