Those information the company provided are official statement and not the word by window person, right? Then what do other employees told you? or You have never met them?
If you have official statement by the company, you can consult with the local government office.
http://saitama-roudoukyoku.jsite.mhl...gn/advisor.pdf
In this document, they do not disclose their e-mail address. Call them, get their email address and send them the facts you can show.