expedite request approved, how long will it take NVC to transfer the case to Guangzhou?

[yuzhang0722 0]

I am petitioning both of my parents to immigrate to the US.

Guangzhou approved my two case expedite request on 4/15/2015 as follow. I did EP for Guangzhou and sent all documents and fees to NVC.

'The U.S. Embassy/Consulate General has accepted this case for expedited processing. This file will be immediately forwarded to the U.S. Embassy/Consulate General. Any further questions concerning processing or the interview appointment date should be directed to the U.S. Embassy or Consulate General.'

But when I called NVC today, they said they need 2-3 days to forward my case file to Guangzhou even though they said immediately on the email. So looks like they have not forward my case file yet.

Does anyone have experience what should I do now? Is there anything i can do to ask NVC to forward my case file faster?

I request April interview when I apply for expedite. Should i start to contact Guangzhou now? To let them know they will expect two cases coming and ask them to schedule my interview in April. Or is there any possibility they can schedule April interview?

What Guangzhou will do when they get the expedite casefile? Is there any point i can fast forward the progress at Guangzhou. We really have a deadline to catch, so trying get interview as fast as possible.

Also, i saw on other post said check progress on DOS. Anyone can help me with what is DOS and how can i check progress on DOS?

Thanks a lot for any help.