Chào chị PhuongChau sau khi gửi thư hỏi số Case Number thì tôi nhận được e_mail trả lời như sau:
Dear Sir/Madam:
We updated the mailing/email address for this case. Please continue to notify the NVC of any change of mailing/email address, or change in personal situation that may affect the principal applicant's entitlement to a visa.
The case number for this visa petition is HCM2010739287.
Rose
National Visa Center
Written Inquiry Unit
PAE, Support Contractor
IMPORTANT:
If your visa petition is currently processing at the National Visa Center, do not let more than one year pass without contacting NVC. If a period of one year passes from the last date of contact (by telephone, mail, or e-mail) with NVC, all submitted fees and documents expire. If this occurs, the fees must be paid again and documents must be resubmitted in order to continue the immigration process.
DO NOT mail original documents to the National Visa Center. You will need to bring these to your visa interview at the U.S Embassy or Consulate.
Cám ơn chị PhuongChau và Chúc chị nhiều sức khỏe.