There is one phone number that is calling me daily trying to get me to sign up for different things. I am tired and they are not removing me from their calling list.
Go to your calling log. Long-press that number and see if "Add to Auto reject list" comes up. If it does, tap it. The phone will receive the call, but it won't ring. After a while they'll add your number to their "don't call" list just to stop wasting their own time.