I'm sorry... being that I'm in the U.S. I don't know anything about this. But, in general, what occurs to me reading your post is that as far as your actually being listened to this time, there's no way to ensure that... unfortunately. You just have to do the best you can do & leave it at that. If things where you live work the way they do where I live, a lot of the time it seems like "the powers that be", so to speak, have pretty-much made up their minds & it can be tough to change them.

As far as writing your letter so you don't sound angry is concerned, that is certainly a valid point. I wonder if there might be any kind of mental health organization where you live. If so, perhaps you could find someone in that organization who could go over what you've written & help you make certain your letter comes across as well-reasoned & appropriate in tone. Of course, it wouldn't have to be someone connected with a mental health advocacy organization. But someone like that might be a bit more knowledgeable with regard to what you're up against & how to address it as successfully as possible. Just a thought...