Got a call at 4:35 pm EST, no one there, eventually disconnected itself after 20 seconds.

I got a call too.

www.protectron.com

1-800-811-1818  

to have number removed.
they also have another phone number
1-888-309-0008

see also posts at 310-455-6048

I got a call from this # with no one there. I called it back, got a recorded message, and its a "life safety program offered by the largest security system in Canada".  You have to choose "1" (to get the package) to get the nanme "Community Safety". Sounds fake to me. There's a push 0 option, but when you do the message is "that is an invalid key choice".

no one at end of line when I answered

I answered but there was no one on the line.