That's a really useful comment. They were calling my house too, but I was on here looking for some useful information about whether I should block them or not. There are a whole ton of web sites on the web about these numbers with totally useless information, 800notes stands above the rest so let's keep it that way. I called this number back and got "All circuits are busy." Most likely a recording on their part so they don't have to answer calls nor give identifying information. They are now blocked!
I listened to my voicemail, and I heard 10 seconds of silence followed by a mechanical sound of a line picking up, then a woman's voice saying "Hi, this is Emily with Senior Care, how are you doing today?" And then the line was silent for about 20 seconds while she waited for my voicemail box to tell her how it was doing. I don't know why she wasn't aware she had gotten my voicemail.
Call just came in. Yesterday same call came in at same time from Hollywood , Florida. Todays call and number came in from Lake City, Florida. What's the use of having private, unlisted number and being on DO NOT CALL LIST. They still call.