African Bank Not helpful

I am unhappy with the way my credit card query is being handled, i had taken out a credit card with African bank sometime back and unfortunately lost my job and could not repay, however my account was sold to third party which i subsequently cleared and they took off my name on the credit bureau, however, the credit card that was supposedly sold to the third part is still reflecting on my credit report, i have been trying to get help from the third party who confirmed that they have done they party and it has nothing to do with them but African bank, i have been trying to call African bank without getting help from anyone as they keep on sending me from one person to another without getting any help, in a nutshell am not getting any help in clearing a debt that was sold to a third part and never removed from my profile even after clearing the third party