BLuebean credit card

Bleu Bean credit card. I had one of these cards many yeas ago. My husband settled the amount owing in 2010. Now years later after already having exisiting standard bank accounts (credit card, homeloan etc), they have declined an extension on my homeloan due to an outstanding amount on the "gold card" I had. I had never been issued with the gold card when they changed over and the account was closed. Now they say they still have it as unpaid. If this was a problem why did they increase my current credit card limit by R 100 000 a month ago ! There is no way I can trace the proof of payment that was made at the time in 2010 as my husband has since passed away. I think this is Standard Banks error and they need to fix it. I also have a credit card with another bank that is up todate. If the Bluebean card was an issue I would not have been able to get ANY credit in the last 10 years which I did ! What is going on Standard Bank ?