keep getting this call, but they NEVER leave a message or a name

Same here. They keep calling and calling all hours during the day...sick of it.  They even called 8:20 AM.

Female on the other end hung up. Stupid.

And called yet again! Luckily it's already BLOCKED

THEY CALL EVERY DAY!!!  How do I stop this?  I'm pretty sure it's from someone trying to sell medical supplies to my 70 year old mother (or so they say).  I'm pretty sure this number came up a couple weeks ago, they tried to get info from her but my mother couldn't understand the woman.  My mother then handed the phone to me and I told the woman she wasn't interested.  Since then this number has called every day, I pick up, they say nothing, then eventually one of us hangs up.