I've the same situation, in fact it's been 4 months to the day, since the test has been marked as complete.
I responded to test invitation email and called help desk (1-888-242-2100 (in Canada only)) as well. but there wasn't any new update.
Agent basically mentioned that timeline is 25 months from Application date, also that it's a misconception that citizenship test means getting oatch ceremony in 3-4 months. so, what it means is "Wait for further updates".
though the agent validated the address, contact details and confirmed that no inputs or documentation is required at this stage, just wait and watch.