Hang up. No one on line

These people call 2 to 3 times a day.  Haven't talked to them yet, they hang up after the 3rd ring.  Suspect a bot.

This person call my phone stating he's homeland security, I asked how he got my number and very arrogantly he demand to speak with the home owner.  I proceeded to say to him that I'm the person who's number he dial and don't call my phone again and whatever list he got my number from to remove me from it, and I hang up.

call from Home Protection company, apparently trying to sell alarm monitoring services.

Have had several calls from 469-607-0708 which have been hangups.  Today a person answered and wanted to know if I had a security system and if it was monitored.  Told him I wasn't interested.  But feel this is a scam to find out whether a home is secure or not.  Makes me feel insecure.  Please check it out.  It could be a survey but could also be a telemarketer or someone who would like to break into an insecure home.