Personal Loan Ripp Off

I am utterly shocked. Firstly FNB's call center staff are getting more rude and inconsiderate by the day. Last night after 7pm I checked on my app what my balance was on the loan I have and the settlement amount was R 97 500.00 and some small change. I had money transferred to my account so that I can settle the amount. Today at 10h35 I called just to- confirm the amount and after on hold for 20 minutes the consultant rudely tells me to call another number and while talking she just transfers. I then get told that my Settlement amount is R 98 177.00 which is valid for 10 days. How the hell can the interest be recalculated to R 677.00 for less than 24 hours. ONE DAY!!!! I also then get told that even if I follow up for the next 10 days if the amount is still the same they will generate a new settlement amount each day so each time this will increase. This is pure ****************. The app constantly grants clients pre - approved credit but when you want to- settle it they treat you like garbage. One would think its the other way around.