Loan amount VS interest

I am very disappointed in Bayport as I made a loan with them in 2018 already in an amount of not even R60k yet then they charge me almost R200k interest on that amount. I have also in 2021 sent them my retrenchment forms which they also did not even look at to date I am am still paying this account which has now triple the amount of the original loan amount. They are giving me a whole other story to say that the amount of monthly payments only adds up to a certain amount. I request that they issue me with a paid up letter because this is the only account getting in the way of me even getting a home loan. They must please just update my credit records.