Unfair Costs

I reported *****ulent transactions to FNB ***** Division immediately after I realized I'd been ****med on Friday afternoon and went through the process of fereezing my Cheque account and canceling all cards, noticing that the transactions were marked as "Pending". However, after re-instating my account with new credentials at the FNB branch at Ferndale on Republic on Saturday morning, the transactions were released and debited to my account, taking it into overdraft which will incur costs. On further enquiry with FNB ***** I was informed that this is standard practice and that they could do nothing about it until their investigations, which will take at least a week, were complete and that they could not guarantee they would be successful in recovery of the *****ulent amounts nor of reversal of any costs debited to my account. I find this unacceptable. Has anyone any further light on such a situation?