Who called from 5519462856

I just received a call from this number and when I called back, I just hear a telephone company message that I have reached a non-working number. Looks like it is some sort of a rerouted number to avoid tracing back.

Got a call and they left a voicemail - it was a recorded message for betting on the NBA and offering me some great pick

Received a call that was simply a recorded message that said, "Goodbye"

received a similar call to 84warlok just a few minutes ago.

Just got the "goodbye" call as well.  WTF?