SHOCKING Vodacom Customer Service

I cancelled one of my contracts with Vodacom in august 2020 when the contract reached the end. The agent who assisted me incorrectly upgraded the contract. I subsequently found out, and have been trying ever since, to have his mistake rectified. Each time I phone Vodacom I am promised that the back office will get back to me in 3 working days to fix the problem. More than 30 phone calls later I haven’t heard from the back office once. I am still sitting with, and pay for the contract I cancelled last year August. I was told that my device needed to be handed in for them to reverse the mistake. Because the device is damaged they are unable to assist me. They have ignored me ever since. I have been a loyal Vodacom customer for the past 20 years. Shocking beyond the norm.