Still getting called for contract upgrades

This is my 2nd Hello Peter complaint regarding the same issue for contract upgrades. Previously Vodacom did contact me and ensured me that I'm taken of marketing calls and will not be called for contract upgrades. This was handled very quickly and I thank you for that.

Now a month or so later I get called again. Person from vodacom start by saying we see that you have opt out for marketing and this is not a marketing call. Yet right after this he start asking questions on when I'm upgrading my contract? I'm I staying with vodacom? Do you know you pay more? You know you can pay less with a 24 month contract? We can offer you better prices and benefits?

Isn't this a marketing call? If not how do you opt out for not being called for your upgrades?