Here is the sequence of steps i followed to get to this:
Press 1 (for english),
press 2 (for existing case),
press 6 (for case statues etc),
then press 1( for knowing your receipt no.),
enter the receipt # to get the automated response saying blah blah blah and also at the end saying this is the most upto date information on your case and our customer the same info national customer service agents have (i totally agree with this).
Then choose to continue to the next step "press 3" . choose 3
Listen to the options-
Option 4 "if you feel if you submitted together and one of the applications is left out and not processed (don't remmember the exact message text ..but something about companion case "
1800-375-5283