Who called from 8047320001

Called cellphone. Left no message

Missed the call. Voicemail consisted of several seconds of silence, and then a computer voice said: "Good bye."

I was working in a place with no cell service all day. When I got back to an area with service my phone updated all the calls and texts I had missed. The number 804-732-0001 had called and left 187 voicemails! No joke. All voicemails were 2-3 seconds long with no audio.

Caller said he was my grandson.

I have now received 4 "goodbye" messages in less than 24 hours. When will they figure out I'm not going to answer any calls from this number?