Unhappy customer

Good day,

I was handed over by Wonga when I failed to pay a loan I had with them. I then made arrangements with HTN to pay this in two installments. My first instalment was paid Jan 2020 and the remainder was paid in Mar 2020. I then thought all is well from my end as I had paid what I was advised to pay. A couple of months later I received a text from HTN advising of yet an outstanding amount I then reached to them to try and figure out what is happening. For a very long time no one was able to assist me as they had no idea what I was owing as I sent them the paid up letter. We kept going back and forth on this outstanding amount that nobody could tell me what it was until someone was able to go back and pull my statement we then figured out that there was a legal fee for March 2020 for R342 that I had to pay. The problem now is no one contacted me in time to let me know of this amount and it had now accumulated more fees which it's now sitting at R798.44. I am busy disputing this amount and no one wants to take responsibility for the part of not letting me know in time before the extra fees. I am willing to pay what I owed in Mar R342 but am disputing R456.44 accumulated afterwards.