In an abusive relationship with MTN South Africa

I have had a data contract with MTN since September 2021, and September 2023 will be the end of my 24-month contract agreement with MTN. Since I started the contract, not a single month has data been loaded onto my SIM card. I have been bounced around, to the point where I had no strength left to fight and decided to let it go. At some point, I even canceled the contract and paid the cancellation fee. For one month, my account wasn't deducted, but the following month I received a call from an MTN consultant. Our conversation got interrupted due to network issues, and after that, I received a text message saying 'thank you for reconsidering your decision to cancel your contract,' which was not true. Contacting their consultants is a nightmare; they keep transferring my call until the last caller disconnects the call abruptly. The frustrating part is that even after my contract has ended and I called to cancel it, they are still deducting money from my account. Their complaints department has blocked my email. I currently have no idea what to do anymore. If I go to one of their branches, I was told that since I opened the account online, they won't be able to assist me in closing it.

Fikile Mhlongo