Vodacom Spam

I have been trying for years to opt out of marketing and Vodacom (and their 3rd parties) calling me with offers.

I have tried various options such as their *135*181# service, where I opted out of ALL (Marketing, Third party, Rewards, Promotions, and personal recommendations). But I am contacted DAILY by Vodacom and third parties for upgrades, promotions, marketing rewards, and so forth. I have sent many emails over the years but nothing has happened.

Not sure why I am still with this service provider