Car balloon payment ****

I recently paid of my car with Wesbank in June. They told me I had a balloon payment of R110k. I decided to refinance the balloon payment and do an online application in ,(May before June). They did not process my application in time and the principle debt of the refinance increased due to interest. I wrote to them telling them it's unfair. They requested my ID and salary advice I submitted it. I asked again for them to finalize my payment and told them it's unfair for me to refinance at the amount they want me to because I app**** on time and I submitted everything. Asked to speak to their manager who understood me but also delayed the processing. The debt amount is now R120k and its increasing. Wesbank is quiet