Incorrect debit order

I had settled my Capfin loan in August and yet they debuted me yesterday. I called their call Centre and was told it reflects on the system that I requested a settlement amount and that I settled on the 24 August but that she can also see that I was debited yesterday. I asked her to explain why and she said she doesn’t know but someone will be in touch to tell me if they’ve approved my debit order reversal. Why should it need approval when they clearly see that I have paid up? It is absolutely atrocious how Capfin is intent on ******ing money from customers to the point where their customer service agents cannot even explain why that is.