Stop calling

For the past year I have been getting calls from Elite Mobile (on behalf of Vodacom). I have informed various agents that I am not interested. Today I received another call. I politely informed the agent that I am not interested and cut the call from my side. She immediately called back and demanded to know why I cut the call. I advised her that I have told them so many times to stop calling. I then asked her for her name, whereafter she proceeded to drop the call. Please for the love of all that is holy stop calling me. Just stop. Don't call me to say you are stopping, just stop. Please.