Extremely bad service and injustice

My husband lost his job during COVID which resulted in me assuming all responsibilities and unable to pay my FNB Credit Card. My account was handed over and I settled kow recently however still have an installment of 107k reflecting on Experian bureau. I am being taken from pillar to post ti have this updated to zero. Assisted by a rude consultant in the legal department who said they have nothing to do with it. Experian disputes sags FNB must update. I cannot do anything credit related and it looks like I'm overindebted