ICICI Bank — credit card due not closed even after 14 years after settlement

I Had an ICICI Bank Credit Card 14 Years bank, had to go for settlement for purchases I never made. I was told that the account has been closed but is still open and showing a due. I went to the bank multiple times, I was assured that from their end they will correct it and revert back my CIBIL but no action has been taken so, My CIBIL has been affected despite my healthy financial transactions.