African bank are impoverishers

In 2016 I entered into an agreement with African bank for an installment of R2803.70, at an interest rate of 27%/annum. I had two accounts with them, the other was R777 both at 27%/annum. In October 2019 I then settled and closed the R777 account. To my surprise, African bank increased my installment from R2803 to R4941.70 at 32, 65%/annum without my consent. Nobody told me about the changes, nor was an email or any form of communication made to me. I only saw this on the statement showing my account being R14k in arrears. I went to the branch, spoke to the head office on the phone, sent them emails and even escalated my query to NCR but still no changes. My budget and expenses have been planned around R2803. Any changes, if necessary, should have been communicated with me first. My name has now been dragged through the mud, my credit status even dropped drastically. Of the R2803 I pay every month, I'm being charged R3k interest monthly! African bank are daylight ******s that only knows how to suck blood from the poor and vulnerable. I'm disappointed that NCR is also quite on this matter. I was hoping for a feedback from them atleast