Their mistake is now my problem???

10 years with this bank and they have now made a big mistake, in 2012 I closed my credit card with Standard Bank but some idiot decided it would be a great idea not close it. Aftermath of this is now reflecting badly on my name, I went about having it closed and Standard Bank even sent confirmation of this. I was advised over the phone that this not reflect negatively on my account but look at what we have happening right now. Standard Bank when you read this please call me. I need my name cleared because I won't do it as its your mistake.