Credit card overdue messages on closed account

<p>For the past 2 months I have been receiving messages that my credit card from absa is overdue. This card was closed and has not been used for over 10 years, now I have an overdue amount from three months ago. I have tried to sort it out, and they told me 15 working days, but cannot give me a reference number or anything to follow up on. Today I get a call saying it has gone to a different division for further investigation, which will take a further 7 working days. All through this I am still getting constant messages about an overdue account and even phone calls about the outstanding amount. It is very frustrating, and the inability to get to the bottom of it is infuritating. Added to this I am very worried about being blacklisted or marked as a bad payer, for an amount that I shouldn't even be owing. Unacceptable. </p>