Job Offer Letter Not Received

I have been selected in a big organization as a graduate apprentice as I am fresh to the employment but after my selection process they have not given me any job offer letter or joining letter ,please tell me the reason ,
What else Benifit given by the company I will not receive in future. I need joining letter to show in various place needed, ppl are suggesting to produce fake joining letter wat to do

Hi,
Don't Produce the Fake certificates ever because when organization will do documents verification in that time they will understand your produced doc was fake then it will be black mark on your carrier.
Better to go and ask to management for the joining letter.

Hi
You've not mentioned whether u are already working without joining/offer letter.
In case u are...please ask for a letter. Mail your request to the HR.
Else please call the concerned HR for the joining letter who confirmed that u are selected. If he does not revert, please continue giving interviews.
Hope it helps!!
All the best!