Received a call from this number, but didn't answer because I didn't recognized the number.
They left no message. I called 303-536-6706 and it's a survey service which offers you the opportunity to be removed from their call list.
I added them to my "Blocked call" list.
Left no message. This is probably a spoofed number, however a a search returns this info:
Catherine Brummel. 303-536-6706. 280 Exempla Circle. Lafayette, CO 80026