The trick to making these calls stop is to convince them that they are wasting their time and resources to call you. This is very difficult to do since the resources that they waste are small and the reward of scamming you out of your money is so great. I have found a way however. You must proceed until you get to a live person. Then tell that person in the most forceful, obscene fashion that you can that they should go engage in intercourse with themselves and then call you back to report the results. This conveys the idea that subsequent calls will not be productive and they remove your number from the list more certainly than any other way that I have found. It also is very good for relieving the frustration that they have caused you to feel.
Perversely, this is also what is best for them since it prevents them from wasting time trying to wheedle you into changing your mind.
Try it, you'll like it.
Feel free to cut and paste this advice on similar sites!
Just received a call from this number and I'm in San Antonio, TX. I never answer numbers I do not recognize. I have an Android phone and I save the number under "Spam" or "Survey" then turn on the Call Block feature for the specific number. Works great as calls are automatically declined.
Call from this number showed up as UNKNOWN. I'm getting more and more of this type of call. I'm putting all of these numbers into one contact and have assigned a silent ringtone to it. So at least the call goes unnoticed on my phone and no ring occurs.