Keep trying to contact them. This happened at my institution once, and after getting ahold of HMDA Help we found out that we had missed part of our Quality Edit response that they needed to confirm our submission. As soon as we had that in we received our final confirmation.
I would recommend putting the "cover sheet" information on all your communication so they will be able to find your submission faster.
Good luck!
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We're all here 'cause we've lost control.
Innerpartysystem