Attempting to increase debit order

I received two SMSes from African Bank, stating that they will be taking an extra R400 this month. When I eventually got through to the call centre (now THAT was a painful process), and got to speak to a consultant, she claimed that there were still arrears on my account from December 2013 when THEY tried to put a debit order through early. I had already made arrangements to clear the arrears that was African Bank's fault, which they did until September or so in 2014, at which point my debit order amounts reverted to normal. NOW I am told there is still an arrears amount, almost a year later. I wonder if that has anything to do with African Bank's financial predicament, they are grabbing as much money as they can from those who do actually pay faithfully each month, what happens to those who default, maybe I should as well?