I contacted USCIS and placed a service request to send our case to NVC. They initially replied to the service request saying that they sent the case to NVC and asked to wait 30 business days. That turned out to be false. We waited 30 business days, then placed another service request. This time they replied that the case was NOT sent due to shipping delays and didn't specify when it will be sent. I recommend you placing a service request to send your case to NVC and at the same time request to talk to a tier 2 agent.
Placing service requests didn't resolve our issue, but it may work for you. I'm waiting for a tier 2 callback. When you request to speak to a tier 2 agent, they put you in queue for a callback from tier 2 support that has more information and options related to what they can do on your case. The tier 2 callback may take 30 days, so if you are going to request one, you should do it now to save time.