Blocking Spam Calls

This deals with the land line (VOIP) service.  I recently downloaded a phone log for a month.  I received 415 calls.  With my current filter settings (basically everything I could) 148 (35%) were blocked.  Now, if I could block unverified calls that would raise to 402 (97%).  Don't you think your customers would call you heroes if 97% of those annoying calls could be blocked?  And it's easy, I know, I've been programming computers from PCs to Mainframes for 50+ years.  Here's how you do it.  Somewhere in your code you have an If-Then-Else statement similar to this:  [If Block Anonymous is True And Incoming call is Anonymous Then Block Call].  All you have to do is copy this statement to become this: [If Block Unverified is True And Incoming call is Unverified Then Block Call].  Also, I checked those unverified calls.  Not a single one was legitimate.  And you already know how to detect an unverified call.

PLEASE ALLOW ME TO BLOCK UNVERIFIED CALLS.

Thank you.