Vodacom cancellation of contract

My vodacom contract expired 7/7/20. I phoned the cancellation dept in the beginning of June already to make sure this contract will be cancelled. The lady from the cancellation dept assured me this will be done. She even gave me a refnr. End of July the whole amount was deducted. I phoned them again and gave them the refnr and the name of the lady. This was when I was informed this lady by the name and refnr that I received are not even working in the cancellation dept! And nothing was loaded under the refnr that she gave to me! No need to say that the full payment for this contract that was already expired was taken out of my bank account again today end of Augustus! When I asked if I will be refunded the answer was I dont know. I am so disgusted with vodacom. They are quick to take your money, but not doing their part if you want to cancel a contract. The customer service and cancellation dept service is pathetic!!