DIACTIVATE MY CONTRACT WITH VODACOM

I called the cancellation center number to cancel my contracts beginning of July which my contracts were ending on the same month, the lady that I spoke to said they are still going to deduct end of July I said fine no problem and she did what she did on the system to cancel the contract. I'm surprised now I'm receiving a bill that they are going to deduct the same contract that I cancelled. What **** are playing with people, kindly see to it that you don't deduct/cancel the activation on my account of that R358.99 it's like you are forcing us to be on contract with you, I'M DONE PAYING YOU