Non-existent cancellation

My data contract, which was sold to me as a 20gig anytime, 20gig night surfer is actually a 10gig anytime, 10gig night surfer contract.

Absolutely pathetic service from Vodacom as usual, after trying to get through to your call centre 4x (holding on for min 20mins each time) I finally got through to a cancellation agent Andiswa who told me this would be premature cancellation and cost me R2800 or alternately migration which would cost even more.

For a data contract? How does DATA even warrant a cancellation fee this big? The device is not even worth R500.