Really, why would this person keep calling and never leave a message? I don't answer my cell phone if the number calling is not on my plan anyway...LOL. I am not paying for a call from someone I don't know. If it's a scammer all I can say is...move on, I won't be taking your call!

I keep getting calls from this number and no one leaves a message.  Today, they did pause for a moment before they hung up.  I don't answer calls from any number that I don't know.  

Denver Museum of Nature and Science

Why WOULDN'T they leave a message is what I want to know.

Denver museum of Nature and Science, I'm betting you all had memberships once, and have not renewed...?

Copy that.  I match that description and get these calls weekly.  Thanks for the info, I can block the call with confidence now.