Nedbank legal department "Zuraida" try to de***** me.

On the 29th of October I made a call to Nedbank to get the remaining balance on my credit card that I had not been paying due to unemployment. I was then referred to their legal department as my credit card had been handed over. I was than sent an sms of an settlement amount of which I had payed on the same day. I've been trying to get a payed up letter since from the legal department that my credit card was handed over to but Im not getting any assistance. Been speaking to a lady named Zuraida who denied knowledge of any settlement amount and keeps referring to a lady named Mitchell who's never around when I ask for a payed up letter. Can I get assistance to get the payed up letter as now the lady "Zuraida" is telling me of a different amount yet the sms of the settlement amount has her name on it.