Called a couple times in the past couple of weeks.  Left no message.  I don't believe that 555 is a valid extension anywhere, which is why it's used for fake numbers on TV or movies.

Called, not in my contacts, no message...didn't answer

Yes, definitely a spoofed number.  Caller ID said "Dir Assist TN", which shows these spoofers have a sense of originality and creativity (555-1212 is a directory assistance number).  They are creative but still annoying, since I have to let the phone ring 4 times before it gets dropped off....

Got a call from this number no one answered

Left a message on my machine saying, "Hello, my name is Wayne.  I'm calling from Healthy Blends USA.  How are you today?"

I have never done business with a "Healthy Blends USA' or anything similar and am on the donotcall list, for what it's worth.