Breach of contract

Certainly the worst service provider. I took a contract in January 2021 for a Samsung A30s for R279 per month. Over the course of the years I was being charged ridiculous amounts and when I call their agents everyone seems to give me a different story. From May to July I was charged R303 and their so called agents they tell me about services that I subscribed to of which I didn't or they can't seem to explain the reasons for such. They charged me double in May and it took 2 months for me to get my refund. This month I was charged R550 for an upgrade that I have no idea about, I was not even informed about such. As if that's not enough, they never send me my monthly statements and network signal is terrible. I'm just glad that their pathetic contract is coming to an end this year. I would advise that one should take a phone contract elsewhere, MTN is a waste of time and total ****