I spoke to a rep on one of these type of calls, and she told me that DO NOT ANSWER it. Even if you tell them to remove your number, it takes some time for their system to catch up. By law I believe they have so many days to comply to your request. If you answer the calls again, they take that as a OK from you to keep calling. If you keep answering, it puts your number back in the pile. Best bet is to block the calls. If your phone doesn't have that option (most do), get an app that will block it for you for free.