Yan request a letter from the administration office. I had done that once but there were some hurdles you might have to overcome. If you had dealt with the office of administration, you know what I mean. The office will not issue such a letter unless for special god-knows-what circumstances. Anyway, if you really need it, then give it a try or should I say multiple tries. My suggestion is writing an e-mail to your thesis advisor for help. If the company have any question, they can contact him/her for verification.