CELL PHONE CONTRACT CANCELLATION

cell phone contract terminated at the end of May 2020. I phoned customer care cancelation of contracts to cancel the contract. Person who I spoke to assured me that the last payment will be at the end of June 2020. On the 11th of July I received my account by email and was still billed for the cell phone contract. I phoned customer care cancelations and I was not satisfied with the answers. I called again and was assured that it will be cancelled and it wont show on my statement again Needles to say this never happened and we are already in July and Vodacom kept on billing me for the cell phone contract. I have made more than 4 calls to the customer care division regarding this problem but still didn't get help. today 18/07/2020 I went to Vodacom branch at Mall@Carnival where I was not able to get any assistants for any of the agents there, I was then told to call the cancellations department form my own phone and I spoke to an agent (Thembinkosi from cancellations department) who kept me on hold for long, he then came back to give me the reference number *** am not happy with the service they gave me now I have to pay for something I didn't plan which is inconveniencing me and my finances. HOW DO I GET THIS DELT WITH ?