INCREASED MY DEBIT ORDER AMOUNT JUST BECAUSE I ASKED FOR A DATE CHANGE

This complaint is for FNB Homeloans who dont listen, I aked for my debit order date to be changed to which they sent me an email to say that If the date is changed to the 25th , it will skip to 25th June 2024 as our system does not allow us to go backwards in date order and interest charged on 25th July 2024 will be higher and will revert to normal from August 2024. I responded to this email to clarify what they were saying by asking if the debit order amount will remain the same even though the interest will be higher, they rep**** and confirmed that i am understanding it correctly, I then sent the following instruction; Will the debit order amount still remain the same? So the next debit order will Only be on 25 July if yes you may proceed, they went ahead and changed the date for me and are now sending me an email saying that my new debit order amount will be R17,597.64 which is R158, 53 more than my normal debit order, CLEARLY THEY DIDNT READ MY INSTRUCTION WHERE I SAID THAT IF THE DEBIT ORDER REMAINS THE SAME THEY CAN CHANGE THE DATE, BUT THEY STILL WENT AHEAD AND CHANGED THE DATE AND INCREASED MY DEBIT ORDER, R150 IS ALOT OF MONEY FOR ME, AND WHY MUST I NOW BE PENALISED BECAUSE YOUR SYSTEM CANT JUST CHANGE A SIMPLE DATE, I WANT THIS FIXED BECAUSE LENNY MOTSEPE CLEARLY DDIDNT LISTEN, AND WHEN THE PERSON CALLS ME BACK TO DISCUSS THIS I DONT WANT A PERSON WITH A SNOTTY ATTITUDE, BECAUSE THE CONSULTANTS AT HOMELOANS HAVE VERY BAD ATTITUDES, I HATE DEALING WITH HOMELOANS BECAUSE OF THEIR BAD ATTITUDES