call made to my 800 number with no one at the other end.  When I called the message said "you are not approved to call this number"

yes i recieved plenty of calls at least 20 times a day from all different numbers like this. im paying a privite investigator to track this person down no matter how much it cost and then im going to pay people to put  them in the hospital my record speaks for it self i dont want to report it to the cops but they will report to the cops when there in comma