I keep getting calls from this number.  Constantly.  I don't know anyone in that area code and they leave no message.  I don't answer numbers I am not familiar with.  Anyone know who this is?

I got a call around the end of jan, they are claiming to be a debt collection agency but I don't know why it would come up 321 instead of a 1-800 number. sounds fishy. when I called the people who they said sent them (Verison) they told me that they never sent anything to an outside collection agency.