Like @stelagel already explained, if you want Funcom to give you an explanation of why you got wiped and banned, you need to create a Zendesk ticket with the request type set to “Ban Information (Why was I banned?)”
From what you said, it’s most likely that they banned you for abusing the building system in a way that degrades the server performance. Funcom has confirmed that they consider fence foundation stacking to be an exploit and that players shouldn’t use it.
As for the build limit, there is none. What they want to prevent is the kind of build that creates problems for other players, and that’s not something that has to do with the number of pieces you use, but rather how you use them. For example, fence foundation stacking…