Additional payments for a prepaid number

Hi. This is my 3rd post since Vodacom does not seem to get things right.... After canceling my data contract for Fibre. They still want to bill me for a prepaid line! How the hell does that work. I don't want the data. I will recharge on my own! Previously I had the same issue.. A number stayed on my name as prepaid, was getting billed but the the number was allocated to another person. What nonsense. An additional 230 Rands for prepaid number!!! Get this resolved or I will take all this to the ombudsman cause even the call centre doesn't know what is going on.