How to get rid of persistent bot/hack users?

[Kyana]

There is a report in game function. Use it. It'll be sorted out before too long. No. it's not overnight. It'll happen as long as us players report it. Do not seek instant gratification. Report. Play the game as intended. Move on.

I always did and do exactly this. In addition I add these players to the blacklist so I can see if a character got deleted. But that doesn't happen.
And most of them didn't get reported a few days ago, no, it's been months without anything happening. That is what's bothering me.

[Shirai]

I always did and do exactly this. In addition I add these players to the blacklist so I can see if a character got deleted. But that doesn't happen.
And most of them didn't get reported a few days ago, no, it's been months without anything happening. That is what's bothering me.

You will never see them deleted.
SE doesn't delete the characters upon banning them.

Chance is that you can purge a whole lot of characters by now, I purge my list weekly. (And only add accounts that somehow manage to send me more than one advertisement before being nuked these days.)