Ballon payment issues

I purchased a car in 2019 and i was supposed to finish paying it in July 2025 The ballon payment is starting in August

I called in with the company to get more information i was told my outstanding ballon amount was R93 000 and i have to pay the same instalment money as i have for the past 6 years I agreed at first until things went south

i called back to ask them if i could pay less since i can no longer afford it They refused!!! I cant understand why the ballon amount is almost the price of the car itself This is so unfair

i don’t know how i am to pay this if i cannot afford it worse of all they made the offer for me to pay less at first and they are now refusing