DishTV — Unwanted Promotional calls and recharge reminder calls

I am getting so many unwanted promotional calls and recharge reminder calls from Dish Tv. Even if i block from one number, next call comes from another number. This starts from morning and continue till late night. Please stop calling me for Dish Tv offers and recharge reminders. I know when to recharge my connection and if i dont, dish tv will anyways disconnect the service. So there is no need to call 100 times a day and remind it. When i am in between some urgent meetings, i get a call from unknown number and if i pick up, its from dish tv. Its so frustrating. I work late night till 5 AM and these unnecessary calls start disturbing my sleep from 8 AM onwards. Please STOP THIS!