Unreasonable cancellation rates for something that belongs to be. I don't want your data anymore

Vodacom has quoted me over R5000 cancellation penalty for a Data only contract on MY SIM. I actually want to migrate to a better package with Vodacom and they won't allow me to move from the data i am getting to better and more DATA which i am willing to pay for.

As per the Consumer Protection Act, 2008 any consumer shall be able to cancel a contract and the supplier may impose reasonable penalty or charge for any goods supp****, services provided or discounts granted to the consumer in contemplation of the agreement running for its intended fixed term.

I refute the fact that what has been quoted to me is reasonable penalty on a SIM only contract. How can I be expected to pay over R5000 for data package and still not get that as data? There is no Sim or Wifi to pay off and following cancellation Vodacom will not have any service provided to me so what am I paying for?

Furthermore the discount I have received on this SIM only contract is only R200 per month which and i receive 40GIGS data. How can Vodacom claim that R5000 penalty is fair and reasonable for R200 benefit they have provided me? i even told them that I have received a better offer from MTN but willing to stay with them if i pay more and get a better contract. i mean i am not even using a contract sim. the sim card is mine to begin with