Your congressperson did not send to USCIS the document allowing USCIS to disclosure of information. It's mandatory to submit this document, the congressperson should have known better.
They take 30/60 days to transfer the case , but to schedule the interview they may 12 to 24 months.
If they didn't transfer your case, you have to send it to the address you sent your VAWA/I-485 applications.
If you paid the USCIS just send a copy of the l485 receipt, but if you filed form l912 before then you have to refile again form l912 to send along with form l131/l765
If your attorney never received a denial letter regarding your l485 then it means your l485 can still be used to adjust status, and you don’t have to contact them to inquire about this.