Account Paid Up

On the the 27th of September I settled my account and i received a paid up letter on the 06 October 2017 from Palesa Tonjane confirming that my payment is reflecting and my account is closed up. Today my account is been debited R1006.00. This morning I send an email to her and she hasn't responded . I have been phoning from the morning till now as it is 15:09 there is no answer. I need that money to be reversed into my account today. I have debit orders that needs to run through. I guess if they rejected due to insufficient funds Nedbank will be reliable for the penalties.