I read your statement written in CiteHR site. It is quite amazing. By the time you joint this company, on the same day you must have your contract on desk and after that you could start your job. Furthermore, you can refer again in HR department and listen what they will indicate than talk with them in a better manner. you both should come to a conclusion. If the HR practitioner reject and can not respond you logically, you can directly contact with HR director or CEO/ the company owner.