As no one here on this website to identify unknown phone numbers is calling you no one here can answer your question. If you don't know the number calling and they don't leave a message it's more than likely not worth your time.
The call was from Humana Pharmacy verifying that we knew that our medical supplies were at our local post office, ready for pick up. The only reason they called was there had been a mix up and a delay in shipping so we were close to being out of meds. They have never called with any other order.
But, Humana in general does call quite a bit as another post stated.