They called my small business and as soon as I heard that they took several seconds to answer I knew it had to be a scamer or robo call. I hung up before they answered.
Picked up a voicemail from this number. I called them back and the same voice on the voicemail picked up and I politely asked if they could put me on their internal do not call list. She politely confirmed my number and said no problem but that it could take between 24 and 48 hours for it to "register".