Called and no voicemail

Several calls over the past 24-hrs, but caller leaves no voicemail. Quick google search doesn't turn anything up.

Same here, called.twice in an hour. No message left

Called twice yesterday and hung up after 2 rings. Called again today and I answered, they knew my name and address said they are calling about free solar panels and not selling anything- gave me an attitude when I said I was all set. Continued to say it's an informational call, I hung up. I'm already on the DO NOT CALL LIST, blocked the number.

Called 3 times in less than 24 hours. Doesn't leave any messages.