Called back and if you don't use the phone they called you get dropped. It's a scam www.heycosmo.com is the website. Just incase you all wanted to know it. Now you have the info do what you want
I woke up and found that number on my phone as a missed call. No voice message was left. The call was made at 1:22 pm. I live in California. I didn't recognize the number so I decided to google it. I never tried calling the number back. I was asleep when the call was placed so I have no idea how many times the phone rang but the phone never woke me so it probably didn't ring very much.