Cancellation nightmare

For the past year I have been trying to cancel my Vodacom account which is up to date on payments, and past the contract date. I am currently living overseas and have found this to be a very trying process. Every time I try to communicate with them, I have to answer questions to verify who I am, which is understandable, however, after supplying the information they need, they take so long to respond that my verification process becomes null and void. I have even tried to respond and forward previous communication on the same email address so that the process will be quicker, but they ignore these messages and I have to start the process from the beginning again. Furthermore, I have said many times that I am not in South Africa, however, they persist on wanting to phone me to cancel the account. When I provided my overseas number and time zone, I received no contact. I have provided a family members name and number in South Africa, whom they have called multiple times. Every time they speak to him, he provides my details, gives them my email address and they say they will contact me. They do not. He has also done this on multiple occasions as every time he speaks to them, they do not seem to have my email information on their system. I have tried the online chat system many times, and every time it says "Our Vodacom Consultants are currently unavailable" and gives further suggestions for help. None of which are helpful. I am at a loss at what to do. I have been paying this account every month, wasting money on a phone account I cannot use (since travelling back to SA is impossible with Covid) and have not received any assistance from Vodacom in this regard.