Unhappy Vodacom Customer

I currently have a Vodacom data contract, I contacted Vodacom to move over to Fibre with them because I had an exsisting contract. I was told when appling that once the Fibre was approved I could cancel the current data contract which I was happy with because I could not afford two contracts. Once the Fibre was approved I then contacted Vodacom to cancel the current contract just to be told I cant. I do not understand this..WHY WAS I GIVEN INACCURATE INFORMATION..why cant I move from the one to the other its the same company. Very Dissappointed.