I was called by Rochelle with a National Security Protection Service saying she could have installed a security system. The intro script indicates my number came from a referral source, including a neighbor (this was for homeowners and I live in an apartment complex). She said she didn't know the referral source as she didn't work in marketing. I stated I wanted to know who referred me prior to proceeding. She stated there were thousands of sources that came in and couldn't be tracked down. I hung up the phone after this statement. There were multiple voices in the background (likely a boilerplate operation) and it didn't respect my being on the National Do Not Call registry. I know who they are now and will not answer my phone for them in the future.