Standard bank vihicle finance

I was financed by standard bank on my car around 2017 towards the end, all along things were good until they start increasing the car installment from last year. When i do enquiry about that they told me that our agreement was to increase installment every month. I was paying R4340 but now is increasing to R4600 which is not wat we agreed. They are milking us when they see we are about to finish installment. They are just blood sucker.

I am so ****ed.