Debt Busters Poor Poor service and incorrect information related to payments

I have paid my installments correctly from the word go when I entered the debt review program. I was very excited to complete the process on the end of October 2021. Unfortunately as per Debt buster I had 1 account that was not paid up and they could receive a paid up letter from the credit provider. I request please send me the settlement amount as I really wanted to be debt free. I received a sms from Hyphen PDA (company assisting with payments to the credit providers) stated the final amount I need to pay in November 2021. I did as always pay the amount on the 25th of each month. After the payment I requested my clearance certificate, but where advise again the account is still not paid up. I did call Debt buster but no one can tell me how this happened or who made the mistake. This is after I was cut over more than 3 times, promised they will call me back and also will send mail to respond. Only answer I received I need to pay.....pay...pay. I found this very frustrating and the process is failing as promised. I called again today and still no one can explain why the right amount was given to me in November to pay. Surely a company that works with money (people's money) shouldn't make mistakes like this........very disappointing!!!!!!