my guess also.
Answered the call a few days ago because they called back after I ignored them the first time.
The caller asked for someone who wasn't home. I asked who was calling and he said "Andy," (that's all).
Then he said he'd call back when asked if I could take a message.
Today the number called back, but I'm chosing to ignore for now.
Called twice in a row then again about an hour later.