An unknown company called on my cell phone. I called them back on my land line and asked them how they get the phone numbers they call. The lady I spoke with said they are given the numbers and that they are a third party. I told her they must not check the do not call list, because I am on that list. I asked again on how they get the phone numbers and she told me since I am not going to get the security system, she wasn't going to tell me. I told her then your company must not be a legitimate company, and I will be reporting them.