Approval notice undeliverble. What to do?

來源: 2007-01-05 18:20:19 [舊帖] [給我悄悄話] 本文已被閱讀:

My NIW approval notice was returned to USCIS and displayed as undeliverable. I have called customer service center and the address has been updated. It has been three months and still the notice has not been resent. Called many times. What else could I do? Thanks for your advice.