Wont stop marketing after asking 4+ times

I get a phone call at least once a month from Cell C telling me that I have been pre-approved for some contract.<br> <br> On many occasions I have told the call center to please remove me from the marketing and that I am not interested in a deal as I am happily on pre-paid.<br> <br> Today I got another call from \145"and I asked the lady why am I still being phoned? She says it's the first time she called me. I asked her why have I not been removed from marketing as I have requested so on numerous occasions. I lost my cool and told her that I told the previous caller to F-off and stop calling me. She informed me that all calls are recorded"