Complain about unfair treatment by Netsta tracker

I had an account with NetstarALT to cover for my cars in around 2017/2018. In around 2019/2020 I failed to make payments due to covid19 financial pressure. They continued to accumulate interests even though I requested them to cancel my account. In 2023 they sent sheriff's to come and attach my belongings because I was allegedly owing around R27 000 due to legal fees. After showing them proofs of payments they agreed to stop increasing interested as long as I don't skip paying R1000 until I finish. I continued paying R1000 and even added extra R200 hoping to speed up my payments. I sent proofs of payments to one Mellisa, Julian Vander Merwe and Deon Musikidi.They didn't send me any statements except calling me and telling me the balance of their choice. On 16 May 2025 one of their lawyers called to indicate that I'm owing R12746.38. I didn't have a problem since I understood that my balance is going down. In June 2025 someone called and indicated that I was owing R27 000 and some couple of Rands which included legal fees. I asked how may times should I pay legal fees since I have never skipped payment since our agreement that no interest will be payable until I finish payin.g, but she failed to give proper explanation except that it is due to legal fees.On 9 July 2025 a certain Thandi called to say I'm owing around R23 000. I don't understand exactly what Netstar is trying to achieve.