multiple calls every day from different numbers

I receive 4-5 calls a day from BR Interviewing, saying they want to conduct a survey. I never signed up for this. I have asked them every single time to stop calling me and to remove my number from their list, but I am still getting several calls every day, in the morning afternoon and evening. I blocked one number and the next day they started calling from another number. These people just don't stop. It's total harassment.