Is this a calling service for a security company?  My number is on the Nat'l Do Not Call List and I still get these type calls.  They won't leave a message, they don't answer when you call back.

Call on my cell phone just now from 903-780-2431.  Hung up when I realized it was a recorded sales pitch.  

I missed a call from this number today about 6:30 pm.  I did not answer and they left no message.

Never leave a message but when I answer they want to offer home security I tell them "no" and remove from list. Still get robo calls and enter code to remove from call list-never happens, the calls continue.

This company has called me three times trying to get me to buy their security system.  The third time they called I pressed "1" and connected to a live person.  I asked to be taken off their list, because I had no interest in their system.  She said "sorry" and immediately hung up.    ...I thought I was on the "no-call" list...which I realize be another government scam.