In need of a letter that states the amount in arrears is paid

I called RCS on Monday the 15th of June 2020 to request a letter that states I have paid up the amount that was in arrears, I was told I will receive the letter via email after 72hrs. On Monday the 22nd of June 2020 I called again because I had not received the letter, the gentleman helping me said he had escalated it to his supervisor and I should receive the letter by close of business Monday. On Tuesday the 23/06/2020 I had to call in again to ask for the same thing, Andisile who was helping me told me the supervisor who was supposed to send me the letter is not in on Tuesday. She also escalated to her supervisor and promised I will receive it close of business Tuesday. I had to call in again on the 24th of June 2020 to ask for the same thing, the lady helping me said the email they sent it to was spelled incorrectly and she had fixed it. She also promised I would receive it end of business on Tuesday. It is the 25th of June 2020 and I have not received this letter. I have no idea what is the point of authenticating with email if your consultants can't even tell the difference between a customer's name displayed on their system to that on the email address. I am so frustrated because I am in desperate need of this letter but surely I can't be calling the same call center asking for the same thing everyday!!