I don't think so much it is the particular airline as it it the agent you get, the approach you take and some gentle persistence on your part. Some have reported better success when doing online adjustments/comments/complaints. Some have reported going up the ladder to a supervisor or two and getting results.
The first line representative pretty much has a script to follow and probably little leeway in most cases. Until the flight for sure is cancelled then it will show as scheduled. I would make another call, politely speak with a supervisor and try again.