Just called my business. I answered, and after a long pause, I heard an unintelligible voice, similar to the adults in a Peanuts special, followed by the caller hanging up. Added to my blocked list.
Called me 5 times in 30 minutes after I didn't answer. No idea who it is, they didn't leave a voicemail. If you're that intent on calling me and want me to respond, then leave message.