Received a calls from this number several times, they let it ring until my answering service clicks on, but they never leave a message.

Three calls within two hours to my DNC registered number.  Left voice mail  three times that if I remembered sending in some sort of contest entry (I did no such thing) I should return the call.  STOP CALLING ME.  I'm not that stupid/gullible.

This number keeps calling and then hangs up

They called three times this afternoon--about once an hour.  Left the identical voice mail that they were calling from a CPA firm to tell me something about a contest I entered.

Scam or telemarketing