Received call from this number early on a Saturday morning.  Person was in front of my house in a ADT Alarm company service van.  Claimed to have an appointment.   I've had an ADT alarm for four years - and no they did not have an appointment.  Told them to "go away, no appointment or contact had been made with home owner".   Talk about high pressure sales tactics - I had been considering disconnecting from ADT - now I am certain I will.