Find out who your congress rep is and give them a call, I called mine again a week ago to help me out and they sent me the response they got and they actually respond faster to them and they can see that you have your congress rep backing you up this is what they got:
Sent: Wednesday, January 24, 2018 3:05 PM To: Trujillo, Rafael Subject: RE: TORRES, NORMA CRM:0749034
Thank you for your inquiry, relating to the I-821D request, receipt number IOE———, filed with U.S. Citizenship and Immigration Services (USCIS) by Vic.........
U.S. Citizenship and Immigration Services (USCIS) records confirm that this case is pending background check clearance. USCIS is committed to adjudicating immigration benefits in a timely manner while also ensuring public safety and national security. A small percentage of applications and petitions have unresolved background check issues that temporarily delay adjudication. Although USCIS makes every effort to resolve such cases promptly, USCIS is unable to speculate when the background check will be completed.
If a background check reveals an issue that may impact an applicant’s eligibility for the requested immigration benefit, further inquiry is needed. The inquiry may include an additional interview and/or contact with another agency for updates or more comprehensive information. Upon gathering and assessing all available information, USCIS will adjudicate the application as quickly as possible.
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USCIS - California Service Center