By law - all phone companies must pass along every call. That's why, if they offer call blocking, you must block the number, not them. Want the law changed? We'll leave it with you.
Here's a thought, if you have caller ID and don't recognize the number, don't answer it.
I used to get calls from the some BS police association. I finally answered one day and said, " you have reached a number that has been disconnected is no longer in service."
Never got another call from them!
Next time you get a call answer with FBI special agent Johnson, may I have you name? They hang up right away! Another way to have some fun at their expense is say that the number they have called has been changed...the new number is. (Whatever your local police department is or sheriffs office,.)