Credit card on my name - which I did not know exist

Good morning, I have app**** online for a credit card and the application was declined stating that I have an existing classic credit card at collections. First of all I did not apply for a credit card at previous instance and are unaware of the existence of a classic credit card. Collections confirmed nothing is outstanding however this card blocks me from obtaining a credit card with FNB. They escalated the matter to be removed. Could this please get sorted ASAP as I want to obtain a credit card ASAP otherwise I will be taking my banking to Capitec as this is absurd that I am unaware of classic credit card and would like to know whom has ordered the card?