Misleading

Nedbank Credit Card what a nighmare all I wanted to do is pay off the balance . On 31 July 2020 I called in to request the balanced owed I received my paid up amount via email on the same day I paid it the consultant adviced me use My card number the one on the card as reference this morning I wake up all the money is reverse with a new balances with an add amount of almost 700 extra what .... I couldn't believe it . person just want to get ride of the debt and all this financial services is trying to do is to rip me off . I'm angry and frustrated.