hello
carvalho (Pedroife), 1st step is to read our
current server rules
;
as tomate said, you already been warned by me for the same reason: illegal station spreading;
Now, to you understand the spreading concept: when you make/place several station parts (road station, rail, etc) with the ONLY purpose of "extend coverage area to additional resources including towns and cities", or making them by more then 1 road corner, it's considered unfair, therefore illegal.
I'll even write the above lines in portuguese to see if faster understanding:
quando fazes/colocas partes de estações somente para estender a sua cobertura para chegar a recursos extra, incluíndo as localidades e cidades, ou fazendo-as além de 1 curva na estrada, é considerado injusto, e por isso ilegal.
hope it helps, but 1st thing you have todo now is read the rules (link above) and if any doubt remains, feel free to ask us. About the ban, it's on tomate but maybe will help if you understand the illegal spreads you made and say that won't repeat it (by really meaning it).