Received calls yesterday and today from this number and they left no message.

Received 4 calls in one day, never left VM.

Frequent calls, never answers. Put block.

Calls started July 6th, 2 or 3 calls per day. Caller ID shows "Unknown Name" and they leave no voice mail. Number permanently blocked.

Numerous calls from this number - never a message and no caller id. I hope they enjoy my blocking them.
Too bad everyone who gets these calls doesn't call Verizon or ATT whoever is your phone service company and complain to them to the point they are losing the ability to handle any other phone business. I get at least 100 calls like this every month - that would be 100 calls to Verizon to complain just from me alone. All of these calls regardless where they may originate come to us over the phone companies lines if a land line home phone - it's their lines so make it their problem too. If they were collecting money from each caller, Verizon could tell you in an instant who it was and where it originated - so the excuse that they have no control is false.