Never leaves a message calls late

I received a call from ADT about being a home owner and i asked them where they got my number from.  They hung up on me when I asked information.  I called back to the number, but they did not pick up.  I opted out in their IVR system, but it is frustrating that a company will allow its reps to hang up if you start asking questions.

Just received the call no sound 10/24/11

received just a few minutes ago I didn't answer but the guy on the other end called me a liar I didn't even say anything whats the deal.

Just received a call (10/4 @ 12:23 pm PST).  I've received no less than 10 calls over the past week from this number.  They never leave a message.   I assume it's some type of telemarketer...

They say they are a home security promotion company when I call them back.

Its ADT home security sales. They won't take no for an answer! so frustrating!!

Same thing with me...  It rings then goes dead!  I have a unlisted number... How are they getting my number?

They call my work # - called over the weekend & left no message & they just called when i answered it; it started to ring back to someone - no one picked up & it was disconnected.

got a call from this number, it's about home security products.  i asked the caller to remove this number from their list.

Same thing as JNL. I answer, and it begins ringing like I called someone else, then the line goes dead.

Three calls so far today, one with background noise, one was missed, and the one I just answered was silent for a few seconds, then began ringing as though I called someone, no answer.Reply !

Three calls so far today, one with background noise, one was missed, and the one I just answered was silent for a few seconds, then began ringing as though I called someone, no answer.

received several phone calls from this number! never leaves a message.