Sorry for the late reply, I talked to them during their hours of operation which are Monday to Friday, 8am to 8pm Eastern.
The USCIS website has on the right side a little box that says "Need Help? Ask Emma".
you will get a chat bot and I kept typing Live Chat, live chat, live chat until I got into the live chat, which I waited for almost an hour in line to get to the representative.
When you connect with a representative, you have to give your case info, and the petitioner's info for security reasons. Then ask them what you want, they told me which Service Center our case is at.