-Normally you just need to bring your passport, I-765 receipt (EAD receipt), and the I-485 receipt to the local office to help you.
If it does not work after you visit the local office in a few days (3 to 5 days), you can email to this address to complain: cisombudsman.publicaffairs@dhs.gov
You need to provide the officer's name and ID# who you called to USCIS or you contacted in the local office in the email. Normally, after you complain, USCIS will approve your EAD in one or two days.