Frustrated unhappy RCS client.

I was owing money to RCS under MAKRO store and they handed my account to Brooks and Luyt law firm which is the one handling the matter. Now I made contact with the attorneys and made an arrangement with them to pay them and they even offered a discount if the money was to be paid up and I accepted. 1st payment was made into Game stores in Menlyn mall and 2nd payment made at Makro Wonnderboom. I was asked to submit proof of payments and I did and urgently requested a paid up letter which I am now struggling to get. If I paid using eft then I would probably think the money was sent to the wrong account but I paid in stores. I am now told days later that I can't get the paid up letter because the money is not reflecting on their side whilst it left my account. 😢 😭 My life is on hold now after everything else I have done to pay these people. I feel I am treated unfairly and don't understand why. I need answers.