I do not want sales calls from MultiChoice

Multichoice likes to phone with sales offers. I have requested that they do not. Today spoke to Fihle. I asked him to lay an official complaint so that I can get an official response as to why I cannot get off their sales calls. Says he cannot, but gives me a number to call. This is the standard MC number and guess what - go through 6 options and not one is to report a problem .... they waste a lot of ones time and no way to recover anything