Who called from 4232261150

I received a missed call from this number

I got the same message.  I have recently signed up for do not call.

I answered. They're trying to sell security systems. Said I had been referred by a "friend".

2 calls back to back to msg.

Same as above - upon calling back I get a robot on the other end stating: "Please press any digit to be removed from the call list. It may take 24-48 hours to process..." Just block the number and don't waste your time.