Settled my account through the home choice app,no settlement letter

So I went onto the home choice app in order to settle my account because when I called them I was told my account was handed over to a certain collector,when I called the collector they advised that they don't have the account. Seeing that I still had access to my account on the home choice app I made payment of the amount due on the app and settled my account. I have been requesting for a paid up letter for a week now,homechoice agents are rude,I called this one time one of their agents was driving and told me to wait 48 hours in order to receive the letter,she did not even get my details.i get an email yesterday and I was told again my account was handed over,I asked them how is my account handed over because I settled it and on their app it says there is a R0 balance to be paid. I just want this home choice account over and done with,I worked hard to ensure that I settle this account and the next thing I'm being moved from pillar to post with very rude agents. Why do we then have access to our accounts on the app and be able to make payments if you not going to acknowledge my what we do on your on system, what a terrible company.Things are hard for almost everyone financially,and home choice is busy exploiting people,I truly regret settling that account because it did not bear fruits