how to track Perm status without case number

[kvskumar]

Dear Team, 

I am working for an XYZ consultancy. I sent documents for my attorney to file for Labor for greencard processing in Sep 2018. She confirmed that my Labor is filed on Sep 28th.  But they are reluctant to share me the case number. I have mailed them and called them umpteen times but there is no proper response from my employer on case number. Could you please help how to find the status or case number to track the process. Also I am curious is there any specific reason for employer not to share the details. Please let me know. thanks.