ABSA

I purchased a vehicle on the 31st March 2015 (Exactly six Years Ago), At a retail price of R259 000. Six years later I still have a balance of over R254 356,34. I have never missed a single payment. My balance keep going up, even though I never missed a payment. How does one have a balance of R213 946.88 in January 2021 and again have a balance of R254 356,34 in March 2021, without missing a payment? ABSA is ripping people off, please investigate this matter.