I don't know how it's possible for them to disregard my pleas to remove me from their lists. I even told them I have traveled to SE Asia and been exposed to locations with malaria (true story), but ultimately had to resort to blocking their dozens of local and 800 numbers on my phone.
Yep, I don't know if they're straight up spoofing caller IDs (I can't imagine they could actually get away with that), or if they actually own numbers in every exchange so they can make local calls, but it's incredibly annoying...
They changed my number in their database promptly and effectively when I asked them to during a blood donation.
I redirected it to Google Voice and configured their numbers to go straight to voicemail. I figure if they have anything important to tell me, they'll leave a message.