FNB Personal Loans *****s money out of your account

On 25 Feb 2019 FNB Personal Loans department took R4350.00 off my account after we had made an arrangement that I can only afford R500 per month. The very next day they took R2000 for apparent arrears on the account. I have spoken to them numerous times telephonically and they refuse to refund me any of the money. What is the point of making arrangements when they ignore their clients. I have now lost R6350.00 of my salary for the month and I have a 7 month old baby that needs formula and nappies. This is shocking that there is no communication to ask if they can increase the arrangement amount and what is more shocking is that I have been to the branch in Boksburg twice to try and get the reversal, I have phoned numerous times without any help from extremely rude staff members. still no feedback after two weeks of pleading.