Just returned a call from this number to my home office and there was no answer but the voice mail said his name was "David", so I just hung up without leaving a message.  He immediately called me back and wanted to know who I was, I gave him my name and said I was just returning a call from him and he started shouting obscenities at me, apparently assuming I was a telemarketer.  I was so shocked, I just hung-up . . . guess who won't get a return call the next time he calls me.