FNB: Block this unnecessary debit order

I have this nagging account from Intec College called Edo Attempt, it attempts to collect funds (*****) from my account an amount of R680 which I have already cleared with them including receipts that I have already paid to confirm my sister is out of the private college. I am frustrated because FNB wants the Edo Attempts to first be successful (deduct R680) (deduct R680) from my account BEFORE they decide to block the attempts. These attempts have been going on for over 12 months (3 times per month) with a R8 fee FNB charges me for each attempt. 12x3xR8=R288 currently deducted. Should I close my FNB account?