The worst company ever... I want this resolved and a I want a Paid Up Letter

I am very dissappointed in the level of service received from this company. I was contacted by one of the consultants to make payment arrangements on my Lewis account. at the time the amount was plus minus R900 I advised that they can debit R200 a month from my account over 4 months and was advised that the last amount I should either do an eft or cash payment for the balance as the 5th month the amount will be less than R200. I called on the 24.06.2024 to confirm my balance and was advised that it was R356.20.. they debited the R200 on the 25.06.2024 and I eft'd the R135.20 later the evening. On th 26.06.2024 I called to ask if they received the R135.20 and they confirmed that the amount was received and the account was settled in full I just need to wait 21 w/days for my Paid-Up letter. on the 10.07.2024 I received an email that states I still have an outstanding balance of R222.99. I called customer service to find out what's that all about then they just said they will escalate and I got a email the same day stating the same amount... Today I called them asking what the closing balance is the guys said it's R450 something !!!! like what the hell and when I ask how do they get to this amount he cannot give me an explanation and when I ask him if he can see the email which was sent to me on the 10.07.2024 he says yes and he can see the amount but he will escalate.... HOW MANY TIMES MUST THIS BE ESCALATED? AND WHAT MUST BE ESCALATED? I DON'T UNDERSTAND HOW I AM PAYING INSTALLMENTS ON A MONTHLY BASIS BUT THE AMOUNT KEEPS ON INCREASING!!!!!!!!!!!!!!!!!!!! I WANT THIS ACCOUNT CLOSED AS SOON AS POSSIBLE AND I WANT A PAID UP LETTER AS SOON AS POSSIBLE