Stop taking my airtime for R3 data bundle, I dont want it

I want Vodacom to stop doing this data bundle for R3 because I never asked for it. I called them but still my money is taken. I told the agent, when I buy airtime is to make calls not for you to use it as you please. I have a router that I am using for data, or else I am going to port my number because this is unacceptable and it gets irritating. I do not want your data and I never asked for it, leave my airtime!!!!!!