Perhaps my experience was specific to my research department, but it was (in the end) handled by HR. The regular procedures for employee discipline were not followed in my department, my requests and complaints were repeatedly ignored, and I was never granted an exit interview. Even after I raised serious concerns about the operations in my department, I was encouraged to quit my position, and was black-mailed by my manager. I expressed this to HR, and while I was told someone would look into it, I was ignored.
Again, this may have been specific to my department.