Worst Customer Service

I bought a car from a dealership that was financed by WesBank in 2020 October,soon after a month or so I got a letter indicating that my installments will be reduced and will remain the same throughout until my very last payment,but each and every month my installments are increasing with in a way that is unacceptable,and I did not sign up for that,they didn't even notify me of this. I sent them an email about this issue and requesting them to fix that problem because I cannot afford such ubruptly brutal increasing installments when I have a family to take care of,then soon after they responded by saying when I they financed the car they decided to make that a compound finance and that my installments will keep increasing till they decide they have reached enough increase,then at te end of that email the person who wrote ended by saying it's not his problem to solve. WesBank staff have no remorse and they don't care about customers at all.