They called my office phone number at 7:25pm. I didn't answer, because they Caller ID said "Customer Service" and I wasn't expecting any customer service calls, especially at this time of the evening. I work in a large law firm, so how they got my direct number, I have no clue. They left a recorded message, something about a "security system at no cost to you!". I didn't hear the whole message, as it got cut off - it presumably started playing as soon as my voicemail picked up. The recording had an option to press a button to be placed on their Do Not Call list. Next time they call (and I'm sure there will be a next time) I'll answer and select this option. We'll see if it actually does anything.