I sent a email in advanced and Ellen replied to me also.
Dear Sir/Madam:
The National Visa Center (NVC) received your follow-up inquiry. We previously contacted U.S. Citizenship and Immigration Services (USCIS) and are still awaiting a reply.
We will follow up with USCIS on your behalf. There is no timeframe for when we will receive more information. Please allow ample time for their review.
For more information, please visit the USCIS website at https://www.uscis.gov, or call their National Customer Service Center at (800) 375-5283.
Regards,
Ellen | Inquiry Management
Department of State CA/VO/DO/NVC
LDRM | DTSV | Contractor
DOS - National Visa Center