Dishonor of settlement agreement

I have a loan with African Bank, in October I requested to settle the loan for a period of 12 months of which initially it was supposed to be 30 months, the person who assisted me did as I requested end of October the amount agreed upon was debited from my account initially it was R775.61, the upon agreement of settlement it was R1002.94, in October a statement came which was having wrong information because the amount of money now being debited has changed I tried to communicate with them they sent the correct statement

End of November they debited R775.61 of which I requested to be changed

I don't know what to do now because seemingly they don't want me to settle the amount

Can I please get legal assistance