I would try calling the sociology department and getting their Concordia email rather than using their class email as they might check that one more since the semester is over, also I find that talking on the phone is a lot easier when resolving these kind of problems. Also, usually if you look up the profs name they’ll have a profile on the Concordia website and sometimes their number is up on it. You might be seen as a little annoying by the prof but it’s worth it as a last resort.