Invasion of privacy

I migrated my contract over to Vodacom about a year ago. SInce then I'm being constantly harassed by Vodacom & their partners. I did not consent to Vodacom contacting me for any marketing. I certainly did not consent to Vodacom handing out my number to everyone & their granny to harass me with their *******. I am also listed on the Direct Marketing Association's Opt Out list - but still the harassment continues? Doesn't Vodacom & it's partners adhere to any code of conduct?? Doesn't Vodacom have any respect for it's subscribers and the privacy of our data?