Harrassment and Threatning Calls on Cell, Work and Home Phone

I have received many harrassing calls and threats from CPS.  Just last week I received a threatning nasty message on my voicemail at work. She was nasty and she said, I don't know why you are not answering our calls, you need to just take care of your responsibility! Then hung up abruptly. I have spoke with them about how they have treated me, but there has been no change.  Something needs to happen!  I no way is it alright for a company to treat customers the way they do.