FNB Housing

I'm very disappointed with FNB for my bond. This is the second time I called them to make arrangement for the arrears on my bond as last year has been a bad year due to Covid so I skipped a month on my installment. The arrangement was that they debit R5000 as but they went and debited R1600 something plus my normal installment of R4300.I called them and no one was able to assist. I reversed the R1600 so they started calling me for another arrangement. On Saturday the 20th I then spoke to one of the consultants and I advised her that I can only afford to pay R5000 monthly nothing more and she confirmed the arrangement but this morning I wake up to an alert that the debited R5869, how can they keep on debiting more the agreed arrangement. I want the extra R869 debited back in my account as the arrangement is R5000 only going forward to push this bond that its balance that is not even moving or going down. I am also not happy with the balance for my bond. They sent me sms stating that my bond installment of R3430. 20 will be debited yesterday meaning that I have been paying more for my installment ever since I got a job in 2018 but my bond does not even go down a R288 901.61 for a bond of R300 000 but it does not even reduce. I believe if I'm paying R4300 every month month for the next 10 months, it means I have paid R43 000 and it should show on my balance but not with FNB. Balance not even going down at all.