Arwyp Medical centre a running a money making scheme

I'm so angry with this hospital that tries to **** me. My medical had didn't pay a claim which they didn't use correct ICD 10 codes and they sent an email in February/March that they didn't receive the payment by then I was no longer working, I told the person who was calling that I will pay when my UIF money comes in then on the 11th July they sent another sms that I owe R1162.75 then on the 22 July 2022 I paid that money; today I received a call from a lady called Dineo who told me I made paid an amount that is short of R133.72. To my shock when did that amount accumulate interest, she told me it's just R100 and few rands I can pay it as if she knows my financial crisis. How can this accumulate interest in such a small space of time? I will no longer be using Arwyp again and wouldn't recommend it to anyone. They are bullies and ****** money from patients.... I refuse to pay that money as I don't have it and paid you the amount I'm aware off. You taking our children's bread money by what you're doing.