Unfair business practice from Lime24

I app**** for a first & second loan & paid in full. When I app**** for the third one, the amount was lower than what I requested. I asked Lime24 to cancel but with no success. Lime24 deposited the money on my FNB account, I was requested to accept the debicheck mandate but I declined(proof available). The money was available on my account without my approval. I communicated with FNB then paid back the mo ey. I sent my PoP through email to confirm the payment. I received an email from from Lime24 that they will rectify the error as soon as the funds reflects on their bank account,that was the last time I heard from them. Calls & emails are not answered but the loan is still active & interest is piling up. Their online system is not user-friendly. The business must reported to the relevant authorities to be investigated because they do not comply with the NCA.