This number calls at XXXX XXXX and the caller ID identifies it as XXXX They leave no message. When I call back and ask who they are I am told they are looking for a XXXX and they can not ID themselves or who they work for because of the nature of their call???? They are an accounts receivable office. Really, as if I do n't know they are a bill collector. I think they believe without a name you can not report them. I told them not to call me again since hang up calls are harrassment.