Arrogant Agents and Harassment

I don’t appreciate being harassed by one of your Vodacom Call Centre Agents, they just kept calling me even after I rejected the call twice. When I eventually answered now irritated, the person could not even pronounce my name correctly. The agent also proceeded to ask me for my ID number, which I refused to give as how do I have any proof this person is actually from Vodacom. I’m not sure what Vodacom is trying to sell to me now but I’m not interested. I’ve been **** to before about so called saving and ended up being charged more.