Frustrated

I called you on the 30 Nov 2020 to settle my edgars account and you offered me a 30 % off since I wanted to settle the amount. I paid that money but when I call you for an paid up letter, you said I have an outstanding amount of R800 and something of which it doesn't make sense because I paid the money we agreed on. I called again today earlier and you said my account is closed. I asked for paid up letter and you promised to send it to me until now