Block spam posting on site

There's a comment form for users to post feedback. Currently there are many spam posts to the form. Need to fix this to eliminate all the spam posts. Very easy. This is not a catcha problem as we have tried different validation methods. Also we have tried taking the page offline and we still get the spam postings, therefore it's not human spamming. Suspect they are connecting directly to the datebase. We also tried changing the db password but still doesn't work. ## Deliverables Currently there is a code confirmation validation for the posting but it does not prevent the spammer from connecting directly to the server database.