Three months of being debited for an arrears arrangement that I paid off!

I was literally here last month writing about the same thing. FNB called and I spent 30 minutes of my time speaking to the consultant who promised to sort this out but here we are AGAIN. FNB please remove this arrears arrangement because its been three months that I have paid off this arrangement on my personal loan but you keep debiting me. But every month you keep trying to take my money for this arrangement that I have been calling each and every month for the past three months to please cancel. Each time, I'm told its canceled when its not. I obviously do not have money for this planned and now it looks like I cannot pay my debit orders! YOU ARE MESSIING UP with my credit score!