The caller identifies himself as George with Medical Supplies Co.  He is calling regarding test strips and meters.  My husband has told him that he uses another service.  But the calls keep coming,  approximately every two hours.  They do not leave a message.  They have a calling list because they ask for my husband by first name.  I have tried to use my phone's blocking capability however, the recording says this call can't be blocked.  I tried to call and got a message that that numbers was not in service.  The calls are still coming.