Bank error on credit card debit order, account with collections!

I have a debit order running for my credit card. The debit order went through, this morning i got a phone call from FNB to say the bank made an error with the debit order and i need to transfer additional funds. I went on online banking paid the additional funds and my availability on my credit card is zero. This was a bank error and not my error and now my funds on credit card is zero, probably my credit rating is affected. I then sent a message to FNB on the online suite and they recon me my account is with collections! I have to phone FNB to ask for upliftment. This was A BANK ERROR not my error. I want my account fixed