I am working in a software development company. After joining to my current company, they are not providing the joining letter. They told me that, I will get my joining letter after 3-4 months. But obviously I got my offer letter before joining the company. In the offer letter nothing was written regarding this. So my question is what can I do now ? Can I force them to provide me the joining letter ? My second question is, is there any rule regarding this joining letter (regarding the issue date and the possible content )?