Vodacom steeling number and data bundles without offering compensation

I bought a Vodacom pay as you go a few months ago and was intending to use it in my wifi router. I then did not use it for a few months and bought new data for it so that I could use it again. But when I tried to use it I found out that the number has now been allocated to someone else without even notifying me. So, in short, the number, I bought now no longer belongs to me and the data I bought for it is lost. Not sure how all this works as the number would have been RICA in my name and now someone else has it. So I then phoned Vodacom and their attitude is "So for you" there is nothing we can do. So I guess Vodacom has lost another customer