unstoppable spammer

You can try blocking it with your .htaccess:

order allow,deny
deny from 213.5.71.12
allow from all

As for wp-ban, perhaps you could try the authors forum for that? (although it does look like he’s no longer updating it)
https://forums.lesterchan.net/index.php?board=10.0

he gets around that too ??

Sure you’ve got the right IP address?