Poor Service by MTN

I am Very unhappy with the service that MTN Is Giving me so far. I subscribe to the month to month diamond plan in September 2024. From application phase I have since struggled. I 1st went to the store at Vaal Mall, I was told I don't qualify, then I went to the one in S E in Vanderbijlpark, there I was just left hanging. I then decided to go to Meyerton where I was issued the sim with no hassles. I intially agree to price of R458.... Over the months I've seen increase. Today I Was debited R499. I called mtn call center but to no avail. I decided to call Mtn Vaal mall. I explained my issue to the Lady, the 1st question I was asked was who? or Where did I take out the contract....She then logged in an advised that I was put on Itemized Billing ( don't even know what is that). I asked for my refund for that Billing because I never subscribed to it. The response I got was.... "this is a systematic thing" and I won't get my refund. The System at MTN decides to put in additional fees? I am not buying this... somebody did this