Mtn just adds/changes my account without even asking me

Got a random sms saying my 1 day free trial had ended to something called Gamezboost, which I'd never heard of and didn't notice the Sms till six days later being informed that at 3,03 rand a day I was going to be charged. Checked *155# and sure enough, there it was.

I definitely did not subscribe to anything and am rather annoyed at this because this happens after about two weeks ago I got a call from MTN saying they would be randomly without any action required from me be changing my plan to be slightly more expensive for more data. Considering I don't finish my current data plan this annoyed me.

Mtn, would you please stop adding/changing my account without my request or even asking first. I don't have spare money for you. So stop trying. I'm really close to just changing my network to someone who will give me less trouble and not just decide to charge me money for things I don't need, want, or even use.