Incorrect Bad Credit record

I subsequently switched to FNB to get access flex bond facility. Out of the blue one day I started getting smses of late payments address to me stating I owe money on my credit card, I logged in online and all my accounts are paid up including the credit card with them, I went into the bank and they said that the smses are mistakes, literally days later I get an account addressed to me that my credit card is overdue, once again I logged in online and all paid, I made another trip to the bank, this time I printed the account and they uncovered I had two profile with the bank each on has a credit card with the same limit. The consultant calls the Credit Card company and She explains to them what the issue is according to them I have been defaulting on payments for the past 3 months on the **** credit card, they said that the duplicate profile has been marked inactive, and that they will write of the debt as bad, I ask the manager Donovon Edwards how will this affect my credit record he responded with \You will have a mark on you record"so I told him this not my fault why should I bear the brunt of a mistake that the bank made. He told me there is NOTHING he can do. Ombudsman time"""