I've started getting calls from this number. They never leave a message. I am hoping they'll tire of this and go away.

The call is from Morning Star, a collection agency. I suspect you have some upaind bills that have gone to collections. "XO" is just a telecommunication company (like AT&T), not the name of the party who is calling.

morningstar is a investment research company
http://morningstar.com/

I called bk they are just trying to sell something

Morningstar is not a collection agency. It's like an online Wall Street Journal. They want to sell subscriptions to their online mag. Morning Star is a reputable and highly thought of investment tool, but why they're doing this junk makes me wonder. Also makes me not want to by. Jeez.

I received the same missed call on my cell as I use that for anything I sign up for online. I did sign up for a yearly subscription for morningstar.com to track and manage investments.  It was about a year ago so it must be renewal time