Hathway — Continuous calling and mind torcher

Hi I have several hathway connection as I have brach office all over Chennai, I have told them to put my number in dnd several time but they never listen, they keeps calling. I am getting minimum 50 to 100 calls everyday, even though I block all their number they come in new numbers to torcher me. If you can arrest these hathway head for min torchering an individual please do it and let them never do this again to anyone.