FNB Covid Loan Nightmare

I am very disappointed with FNB. I had taken a COVID May last year 2020 which I paid it off in February 2021. Initial loan was 33,772.49 and then 4 months later they told me there paid my creditors more than what they should have. I agreed to that after an Agents sent me the statement and all calculations. they added 6,440.86 which made the total loan to 40,213.35. Now 3 months later after I paid off the Loan I receive a call from Rebone telling me that I owe the bank 8000 because they paid my creditors more. I do not know what Mickey Mouse is this. Where does this 8000 come from? I know us being indebted means more money from them but this is ******* and should be regarded as crime.

Rebone tells me they made a mistake. So when they told me that they miscalculated before it was what, joyride? This is really Not acceptable. Now they are going to manipulates the system and send me **** statement to say I owe them. This is ridiculous.