Got a call from this number, to my cell phone. I answered. I said hello twice before a male voice said hello back. In the background, much noise, other voices speaking, like a busy office environment. Then the line went dead, he'd hung up. I hate these calls. It seems like someone is checking to see if the number is "live" so they can scam me later. Irritating

Got a call from same number.  I called back and there was a recording that said "the number you have dialed has been cancelled".  Seems suspicious to me.

Also got a call from them.  They let it ring but not long enough for the service to pick up.  If someone that calls does not leave a message, I don't believe they really need to talk to me.

Getting disturbing calls from this number.  They go to voicemail but don't leave any message.

I received a call from this number - they hung up when I answered. I used a different line to call the number back, it was a spanish recording, which I did not understand. Something about an 800 number. Very suspicious. 678-439 - is a local number in Georgia so the crooks are very savy when they choose their phone numbers.
I wish I could block them all.