unfairly banned

[LaChupacabra]

I'm not admin, my english is bed, but I utter. And so...
It is not a server for a closed group of friends as you write, but for everyone. Perhaps you were too hastily and unfairly expelled, but such accusations on your part are also not fair.
That what you write, I experienced on another server, so I guess, I understand you (I played fair, nobody not blocked, or sabotage, but I brook some custom rules, which I didn't know and I was not even forewarned about this). But you from what you write, I see that you don't have violated any unusual rules on a specific server, but very general rules of this game that you should know. If you do not know, you should be acquaint:

https://wiki.openttd.org/Multiplayer_Rules

As you read, don't be discouraged and go back to the server Next time if someone will be stalked yours products, warn him, and if it doesn't work, you first call admins typing in chat !report