Vodacom, poor services

So basically I'm tired of vodacom, I've had a stupid contract for years, I tried canceling it, and yet the fail to mention that when I cancel it, I have to pay the installment the next month to actually have it canceled.. Now that I'm aware of the terms to cancel it, last year 2019 I put in a cancelation notice in store to cancel the contract, I then pay the next month's few, and a consultant calls me to notify me my contract has been canceled and he promotes me new contracts of which I declined.. It's now March 2020 and I recieve an email I'm in the arrears by vodacom, 4 months later, firstly I went through the steps, then they still delayed and notify me 4 months later I'm in the arrears, and no effort was to contact me. So now my credit record looks bad! And on top of that, I call a the accountants of vodacom bills, and this woman continues to tell me I'm in the arrears and fails to actually try and investigate my situation and just continue to read of her system that I must pay my arrears, as if I'm stupid, I know exactly what I must pay, I Recieved an email, my issue is that I made the payment to cancel the contract, yet I must repeat these steps again! What the hell!! Vodacom is a *******! They just want money, easy to give contracts and provide an services that make you spend money, yet when you come to a problem which results in there being fault with your account or contract, they fail to help or understand, they just want you to pay and that's that!