Nedbank is costing me to be in debit

I had contacted the ***** line to prevent a debit from going off my account everyday from the 5th of Feb. They allowed a company to debit my account costing me R8,50 a returned debit fee and guess what even after blocking my card I was still being charged the returned fee after being assured by the ***** line I would not be debited. Like many South Africans out there I am unemployed and every little cent does count. My account is in arrears of R200 plus due to this and how do I pay it. I tried with the bank to resolve it and all they tell me is they cannot do anything about it. I know most other banks do not allow a debit to go off more than three times unless that has changed over the years but Nedbank has now cost me more than R200 which I cannot afford.