Not that I am the person to mediate, however “downsc” instead of focusing on personalities you should instead have a bit of gratitude to everyone who makes it possible that a completely free enterprise class PBX can be downloaded.
This software is coded by volunteers on their own time or programmers that work for someone else who donates the time to the project. Any support in the forum is also provided on a volunteer basis. I for one am extremely grateful the developers maintain a presence in these forums. They don’t have to.
With any Open Source software you need to see if someone else has had the same problem as you have before. 99.999% of the time the problem can be solved by diligent searching.
When you go to the forums, mail lists and newsgroups of an Open Source project the last thing you want to do is wear your heart on your sleeve. It’s not about you, it never is. The principal is to search before posting.
Lastly not using the “free” software is your loss, do you always give up so easy? I have had paid support folks with much larger attitudes than exist in these forums. Many times English is a second language and this adds another opportunity for miscommunication.
You other option of course is to use a non “Open Source” phone system then you could pay to get your feelings heart by a vendor that is not nice enough.