Telkom Mobile Tele-Sales close to harassment

I lost my review, but in short, Telkom don't even deserve the star I was forced to give them... Three times I was called about my expiring mobile contract, although I told them the 1st and 2nd time that I am not interested and ask the 2nd person to ensure that I am not called again. I was, earlier today, but this guy, Abdool, kept on coming for me, despite all me answers, as I have 40 years of experience in the IT & Cell phone industry and as a result of my own experience on this very same contract. He ended the call with me being "ongeskik", but I rather think he was totally disrespectful against me, the CLIENT and my thoughts and decisions. I will and shall make then in my own time, when it is time. I have no problem with the principle of tele-marketing, but once you said you're not interested or ask them not to call again, they should honor one's wishes and say goodbye... This to me, is harassment and a waist of both party's time. Telkom can contact me - I will supply them with his number and the time of the call as it came from an 081 number.