Luigi Conti Manager

Hello, we have a cloud instance with over 350 active users.
I'm approaching with the.Net DocuWare Platform .NET API for managing the user's creation and the user's maintenance.
I realized that some information, like the email address, can be edited from API but others one can't.

What I need is a way of disabling or removing a user from the system.

I tried to edit the Active property, but don't work.
user.Active = false;
user.PostToSelfRelationForUser(user);

For now, I've created a new inactive group and I've added all the users I have to disable, but this solution doesn't avoid access to the system to users.

Any suggestion?

Thank you

Luigi Conti