Billed for Application MTN ran in the background

I have been billed for an MTN application running in the background which I did not load myself. MTN IT department admitted to me that it was an app they ran in the background. IT Department removed the app as I was not able to via their options. This was billed to me in October 15. Since October I have been paying my monthly statement excluding the R300. Now that MTN's back office have decided against my appeal, my account is now suspended. This is my first dispute since I opened my account then been in my early 20's I am now 45. And I am treated like this. I was in a heated debate with the operator and I said that MTN is not taking responsibility but shifting their problem onto me. I was told I am not a responsible person. MTN is now rendering me powerless by freezing my account and forcing me to pay for their incorrect billing. I am not the only person to complain of resent about MTN Billing. I am now another victim forced to move my business elsewhere. I am leaving my account with MTN today as is and going to another service provider. The operator said to me that I am most welcome to do so.