我可以发email给NVC和广州询问吗？

1.没有收到他们说的I-864
The petitioner in the applicant's case has been sent instructions concerning completion of the Affidavit of Support (form I-864) and supporting documents needed for financial sponsorship. The applicant may want to contact the applicant's petitioner to ensure that these documents are completed and returned to NVC as directed.


2.这里面没有提受益人的文件。交I-130的时候已经交过出生公证和结婚公证了。

3.如果我们已经让缴纳400的签证费，（已缴纳），是不是说明经济担保就通过了？

怎么越想越乱了呢？