VODACOM not living up to their promises

The consultant did contact me after my original review on HELLOPETER and advised that the numbers I have been paying for for the last 3 years will be cancelled and not added to my January bill. However, VODACOM refuses to refund the money as there were apparently "usage" om these numbers. Who used it, I cannot explain. My argument is, if VODACOM acted upon instruction and did their work after more than 30 requests, one of which was acknowledged by a Manager, then I would not have incurred these costs for all these months. Now, they say they can do nothing about it, but they value me as a customer. If VODACOM did not do their work, why am I being penalised because there was unauthorised usage from unknown individuals during these months despite me having cancelled these numbers more than 30 times when I became aware that they are billing me for numbers not in my possession or use.