Maybe that is supposed to be the purpose of all the 3-4 monthly updates. (for me: February, May, August, now soon hopefully something positive in November)
Getting an update at all, and also positive answers that everything with the application seems okay when calling or emailing the recruitment department, I guess those "regular" updates should be enough.
The thing is, personally I would feel much better on a monthly update, because you dont really know whats going on. They seem to have a big pool, but instead of decreasing it, they still do new interviews.
Also, I guess if you push the calling and emailing part too much, they will not consider you anymore, as it gets annoying to get calls from 300-500 people every other day (which is kinda true. even if its only 10% of those people). For me, also the reason why I stopped to call/email after the August update.
I will just have to trust them that they will call me sooner or later.