called twice caller id says CALL- dont know the number I don't answer, they didnt leave a message, when i called the number back the mailbox is full -

I've left this message before, this is not a solicitor, this is a company hired by the solicitor to determine what time of day you are home the most. What happens is this company calls you at a certain time, there is nobody on the other end of this call, if you pick up it will time stamp it. This will go on for a couple of days, if you keep picking up the phone it will determine what time of day you are home the most, once they have established that time, that is when the solicitors will take over and start calling you at that established time. I have gotten three calls a day from this "call" ID for the past 4 days. Best advice don't pick up, I hate these calls just as much as you do, and I'm not even here

I get calls at least twice a day from this "call" number.  This time I picked up and no one answered.  I called back and got a mailbox full message.

"Call" comes through, no one there.  They hang up.  If you call them back, goes directly into v/m that is full.

This number appears everyday and when I answer, there is no one on the phone.