Called my Father with a "personal" business matter. When I told them I had POA they said they would need proof. When I asked why I would send them anything if I don't know who they are she hung up on me.
I had a missed call from this number. When I called back it immediately connected to an automated system that said I could press 6 to be removed from their call list. I pressed six and the system said it was connecting me to a voice mailbox where I could leave my phone number. I hung up at that point because it seemed suspicious.