First app stuck in "Waiting for Review" since Oct 25, status inquiry unanswered

Sing Academy: Learn to Sing (Apple ID 6825501026), version 1.0 with three in-app purchases, was submitted on October 25 and has been Waiting for Review for 11 days with no messages. It's the first submission from this account, and all agreements, banking and tax are active. A status inquiry (case 103017295001) sent on November 2 has had no reply, and phone support shows as unavailable due to high call volumes. Could someone from App Review check whether the submission is queued correctly or needs anything from me?