If you have an issue of this nature, don't make a thread about it. Its against the rules and doesn't actually help your case. Not only that but members seem to like replying to these threads with spam posts which only leads to them being infracted for spamming. So its not good for anyone.
However, when you have a problem like what you describe, PM one of the global moderators and they'll check it out. No one is banned by mistake (its not something you can do by simply clicking one button) and we don't always need to put a reason as to why the person is banned. Thats up to the one banning you. Some times the reason is so obvious that its not needed. Now contact a Gmod and do not post any more in the forum.