bad mtn service from call centres in jhb and franchises in cape town

I am so fed up of mtn and all their departments. I have been on and off calls and in and out of mtn stores fixing the mess they keep on making. They have been double deducting from my bank account for the past 10months. When i call their billing department and when i need to be transferred they drop my call. When i call back no one answers the phone again. The same thing happens when i go to mtn franchises. On top of it all they claim i have outstanding debt but they debit my account every month on the 2nd, and i have never missed a payment. they have ****ty services but expect you to go for the new devices and upgrades and all of that bull****. i am sick and tired of all this nonsense i am never getting the proper help from these people.