Continuously debiting me incorrectly

I am extremely frustrated with ABSA. I have personal loan with ABSA and my account was in arrears earlier in the year. I contacted ABSA collections and requested that my repayments be increased from R2100 to R2800. I managed to bring my account back up to date and was also granted a 3 month payment holiday. I received confirmation from ABSA that my next installment after the payment break would go off in July at and amount of R2150 however they ended up debiting my R2800. I reversed the payment and did an EFT of R2150 to ensure that my account remains up to date . I then contacted ABSA and after holding for almost an hour I spoke to a consultant and asked them to correct my debit order as my account is now up to date and the need to debit R2150 and not R2800. The consultant ensured me that she had corrected this and they would debit me R2150 going forward only to find that in August again they debited me R2800. I contacted the call centre again and was on hold for over an hour and eventually hung up. Can ABSA please so their jobs and corrected as U cannot keep on reversing my debit orders due to the incorrect amount being deducted and reflects against me negatively. I AM EXTREMELY UPSET AND WANT THIS RESOLVED NOW!!!STOP DEBITING ME R2800 AS THIS IS NOT MY INSTALLMENT!!!I WANT THIS MATTER RESOLVED NOW!!!!