How can I run from these professional shark loans.

February 2020, I made a loan at absa and an agreement was to pay it over 60 months with monthly payments of cause. They debited their installments starting in March to August. In the same month of August I paid lump some because I wanted to pay this loan off within 9 months. So it was within 6 months period that I have paid 90% of the loan amount, in September they deducted less than the agreed amount, I called abt the less payment, and asked for settlement balance. Response on less payment was blamed on the system, I was told it is the system that did the calculation, settlement balance is 65 % of the loan amount because I took the loan over 60 months I'm liable for that 60 months interest. I've made several calls many a times absa is duck and diving. I need anyone who can save me from these shark loans, I want move my business from them including my bond, i can't deal with the ****s, whilst the interest rate was decreasing during lockdown these shark loans never decrease my interest rate, they are still parasites feeding from the poor black woman. I am so disgusted with such a behavior and this call was never registered each time I call I have to start afresh the whole story and I will be transfered to 5 different departments because no department wants to man up and take responsibility.