Being ****** by the bank

My account have been have reserved for about R11 222.63 yet the R11 897.14 was debited from my account. I called in the other company that debited and reserve my money and their explaination is that an amount of R8808.23 was not showing on their side as pending so FNB has manually released that amount which made my account to be overdrawn. My debit order bounced because FNB manually released those funds automatically. So unpaid debit charges and overdrawn account charges are bad and FNB expect me to bear those charges which I do not have money for and I can not cover the charges for somebody that did not do their work properly. I have been online with the bank and also losing a lot of money by phoning them and still have to lose money by phoning and getting bad explianation. I am very disappointed in this bank as it was one of the banks that I trust.