MTN pain 😤😡

I was contacted by a MTN agent a few weeks ago for an upgrade on my contract of 3 years I have of which there is a year left. The lady said se could upgrade the wifi to uncapped for only a few Rand more. Come to realize that she made a separate new contract. Since then I have spoken to the many agents even send to MTN store in Kalahari Mall Upington. Apparently they can't do cancellations because the are a Franchise?? They alo wanted to charge me for the free wifi rooter I wanted to return. Now R682 has gone of my account end of November 2025. It was also supposed to be R399. I have send emails as well. No response. Nobody seems to know how to do this cancellation or how to do their work. I am so frustrated 🤬and angry. This is costing me money. Please can someone help me. Vanessa