DishTV — Unwanted calls for new service

From last 1 month i am receiving annoying calls from dish tv made by different number. Once i received call and came to know that they are calling for advertising and promotion purpose. But day by day dish tv calling me with their different number starting from +9144 or +91183 It's becoming irritating for me and hamper by daily life.they calls me over 10-12 times daily.i request them so many times to activate DND service on my number but still they are calling me and their sales representative not ready to hear anything.i am very frustrated.Sometimes i am in meeting or on drive.please do anything otherwise i will remove and throw their dish and file harassment case against company