Data de-activation nightmare

On 17 December 2015, I purchased additional data for my phone via the Vodacom app. After the purchase, I realised that I purchased a month-to-month data package instead of a once-off package. I phoned the call centre to request the cancellation of the month-to-month package. The agent said that she have a problem with the de-activation and would contact the \back office"to do it. On 21 December 2015"