Telkom Debits

I used to have two Telkom accounts, one for my cell phone contract (which is still active) and one for landline + internet. In February I was relocating and I cancelled my landline + internet, but still to this day I am being debited +- R600 each month. I have called and gone into the Telkom store countless occasions, but it doesn't seem like anyone knows what is going on. I have sent documents and bank statements showing these amounts, but still I was debited yesterday. To me, without any reason from the Telkom side for the debits, I feel like you guys are *****ing the money I work so hard for. This negatively impacts me as I have to keep reversing the debit order which I must then pay charges on and it tarnishes my credit score. Its pathetic that such a large company can do this to people, I am very unimpressed and if this matter continues I will have to take legal action.