MTN is ****ming people and has no shame

MTN is a biggest **** that I've never came across in my life. They sold me an LTE device claming it was unlimited wifi. I asked the sales agent twice why it's R299 if its uncapped, and she insisted that it was. 2 days later I could not connect and when I called them they said the data was finished. The next day I cancelled the subscription. 4 months later I received emails stating that I'm owing them R7500, don't ask me how. Everyday I'm calling them, they keep on promising to sort it out and it's been weeks now. I'm spending hundreds of rands on airtime trying to explain the same thing everyday. I asked them to get the recording of the lady that misled me on the recorded line, and it's nowhere to be found. Everyday they put me on hold for over 20 minutes until my minutes are finished. Ive just realized that they doing this on purpose. It's their way of ****ming people.

What they doing to their customers is totally cruel and it looks like they always get away with it.

If there's anyone who can assist me get out of this situation I'd be greaful.