Sanlam Credit card Pests

Please can Sanlam stop calling me to offer me a credit card. I get called at least twice a week. I have tried everything from being nice to being pure barbaric and swearing and yet i still get called. From now on every time Sanlam calls and offers me a credit card I'm going to swear the person until they put the phone down and then I will cancel 1 policy each time until i have no more policies with Sanlam