I m in the same situation. Went to the ceremony and was able to talk to the agent who called me about the cancelation. She said I is their own internal mistake and they will try to expedite the process. Do not want to bring the hopes up, but it happened to a son of my co-worker before and it...
Same for me, the status reverted to "In process" after the phone call, seems we are on the same boat, I m April applicant, done the test in October, Oath supposed to be December 12th. Please keep me updated if anything changes.
From my home country it is one certificate with finger prints which clears you from everything. Is Canada different? They did not ask me for anything from Canada.