How do we get an instance removed?

It looks like a new spamming tactic will be to set up your own instance and then just mass spam to other instances from there. Case in point, vive.im I've been noticing spam in one magazine from a user of this. I banned them, but they can still post for some reason. Decided to visit the instance and it looks like some default front page with '3' active users. If you look at the user's account on there they've made 12k posts already and seem to have a script set up to push their blogspam 3-4 times per minute.

1. We need a clear process to report and get these kinds of things removed quickly.

2. Bans need to work properly and stop these users from posting.