Forum Aggressively spammed: help on how to stem, questions and answers
 

Hello all, i have search about spam threads but nothing more useful or more (if it is possible) advanced have come out.
The problem is, that also with any available human verification manager feature activated on vBulletin administration, i found any day, more or less 500 or 600 new spam threads to be MODERATED on any activated forum. The image verification fail and is very easily bypassed by spammers, and as i can see is very easily to be bypassed also reCAPTCHA. With any of this two antispam measures activated, thousand of new spam threads are posted any day and by the way, and it is impossible to stem it. The only one way to relatively stem spam is the Question and Answer Verification option, that any way is also bypassed by spammers, but in this case, from 3000, 4000 spam threads posted in one day (using reCAPTCHA and Image verification), spam threads decrease until 500, 600 every day.
The worse is that any day, almost one or two posts are validated by the system, and this posts are not marked as MODERATED, this spam threads are visible to all.

Any help and suggestion is really (but really) welcome, thank you.