The last email I got from Brittany was on March 14 at 3:33 PM. It came from the same address you listed.
voltda111@gmexpert.com

Only once back on 2/24/11 I got an email from her that came from another address: ACDelco_Internet_Response_Team@gm.com

I just replied to the 3/14 note to see if it bounces. I will let you know.

You posted:

"They cooperated with VA Brittany and got me the railcar number as well as other updates from order fulfillment."

My VA during production and delivery was Brittany as well. I tried to send her an e-mail today and it bounced. The e-mail address I have for Brittany is voltda111@gmexpert.com. Is that the same address you have for her? Or are we talking about different Brittanies? That address worked as recently as a month ago, so I don't know what's up.

Do you have your Brittany's e-mail address?