Refusal to repay incorrect debit order

I settled my account with Direct axis on 16 September 2015 but they incorrectly debited my account on 23rd September 2015. When I call and ask for a detailed statement on my account, they send it but cannot explain how I can still be eligible for a debit order when I paid off the full balance for month-end, and seemingly more than I owe them. After trying to call back several times, this Maloney keeps saying 'hello, hello,' and then hangs up and won't answer my queries. I am livid at your poor service and reporting you to the banking ombudsman for your ********* conduct as a 'financial institution!