The telephone number of the embassy is 4008-872-333. They have Chinese service. But you need to buy a password card from China CITIC Bank to call them. The services they provide are:
1. Callers can get all information about non-immigrant and immigrant visa categories and related application procedures from the center.
All non-immigrant visa interview time in Chinese mainland will be reserved through the Visa Information Service Center.
2. The caller can get information about the application procedure of immigrant visa. The main applicant of immigrant visa can check whether the immigrant application has been accepted by the US Consulate General in Guangzhou, whether an interview has been arranged, and there is no time for discussion through the visa information service center.
3. Provide group reservation service (please click here for relevant procedures, regulations and rules).
4. The visa center provides services in Mandarin, Cantonese, English, Fuzhou dialect and Taishan dialect.
Please refer to this website /schi/information.aspx for details.
I hope everything goes well!