Over chargered for the product

I called the call centre because i was told I owe R672.00 how I don’t know. I called in I was told I owe R180 for cancellation of price lock which I didn’t do. I didn’t even do anything on the self service whatever they call it. But the lady insisted I I cancelled the product to be over charged hell no. And I was told that I have to pay that amount to continue watching and rendering there services. I didn’t do any cancellation and that they cannot cancell that amount I must pay it. I received such bad service but to be ****** day light by multi choice.