They should have a website. I found mine and they had a local office in my city. I called and spoke to someone on their staff and explained the situation, then they e-mailed authorization forms which I filled out to grant them permission to speak to USCIS about my case. I don't know that it helped, but they did let me know once they sent USCIS a request and then notified me that it had been forwarded to the visa unit at Guangzhou consulate, so it might have sped things up!