Being changed for bundle which should have no longer been available!

At the beginning of the year I got a call from vodacom offering me a different data package for number 0.7.2.5.8.2.8.5.6.4 as they said this package will no longer be available. I was not interested in a different package, requested it to be cancelled. I have now noticed that I am still being charged for this data bundle and have not used it in over 6 months as it was supposedly coming to an end. I would like to be refunded for this please and the number cancelled as previously requested. I have not had any person contact me, except via email requesting my ID and address. I would like this cancelled and sorted out. My main line is due for upgrade and I am strongly considering going elsewhere due to this poor service recieved from Vodacom.