Phone calls don't get through

Sometimes I worry that people are trying to call me, hearing the answering machine, thinking they left a message, but I don't actually hear them.  I have reasons why I believe this.  I know it seems like a strange thing to believe.  But I have had 'phreaks' harassing me and doing things to the telephone for years now, while all this computer harassment and hacking was going on, and they are able to prevent people from getting through, and they can do all kinds of things.