Debited for a closed account

I am so disappointed with MTN SA. In September 2025 I switched from one WIFi package to another. After the cancelation of the old Wi-Fi they continued deducting money in my account, but did not activate the debit order for the new account. I didn't notice this until they decided to suspend the internet connection. Upon following up, that is when I discovered the mix up. I have tried to request a refund for the money deducted for closed account, with no luck. I was just sent from pillar to post. Tried to reach out to complaints department with no luck. I basically lost just over R2000 just like that!